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This mock test of Test: Tree Structure for GMAT helps you for every GMAT entrance exam.
This contains 13 Multiple Choice Questions for GMAT Test: Tree Structure (mcq) to study with solutions a complete question bank.
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QUESTION: 1

70 % of all the staff members in a college are administrators and remaining are teachers. If the total number of teachers is 60, then what is the total number of staff members in the college?

Solution:

QUESTION: 2

A total of 500 students applied to a college for admission to its MBA program. The applicants were either freshers or experienced professionals. If 70% of all applicants were freshers and 20% of the experienced professionals had an experience of at least 2 years, then how many experienced professionals had an experience of less than 2 years?

Solution:

QUESTION: 3

Candidate A, B and C are contesting elections. Each voter can only vote for a single candidate. 20% of the voters refrained from voting and candidates A, B and C received votes in the ratio 4 :3: 1 respectively. If there were no invalid votes and Candidate C got 2 million votes, then how many voters (in millions) refrained from voting?

Solution:

QUESTION: 4

A book publishing company released 100 books last year. Three-fifth of the released books were fiction and all the remaining were non-fiction. 20% of fiction has at least 350 pages. And 80% of the non-fiction has less than 350 pages. How many of the released books has less than 350 pages?

Solution:

QUESTION: 5

In a village 40% of the men are above 25-years of age. Among these, 50% are married and 60% of these married men have at least one kid. If there are a total of 72000 men who are at most 25-year-old, how many of the married men does not have any kids?

Solution:

QUESTION: 6

A real estate broker booked 1200 apartments for sale. All of them were either 2-bedroom or 3-bedroom apartments. Out of the 2-bedroom apartments, 20% had terrace gardens and out of the 3-bedroom apartments, 80% had terrace gardens. If there were 600 apartments with terrace gardens, how many 3-bedroom apartments were booked by the broker?

Solution:

__Step 1: Question statement and Inferences__

We are given that a broker booked 1200 apartments for sale. There are only two types of apartments in these 1200: either 2-bedroom apartments or 3-bedroom apartments.

Let’s say:

The number of 2-bedroom apartments = x

And the number of 3-bedroom apartments = y

Thus,

x + y = 1200 ………….. (1)

Next the question says, 20% of the 2-bedroom apartments have terrace gardens, and 80% of the 3-bedroom apartments have terrace gardens. So,

The number of 2-bedroom apartments with terrace gardens = 20% of x = 0.2x

And the number of 3-bedroom apartments with terrace gardens = 80% of y = 0.8y

It is also given that there are 600 apartments with terrace gardens. So,

0.2x + 0.8y = 600

2x + 8y = 6000 ……………… (2)

We have to find the number of 3-bedroom apartments booked i.e. the value of y.

__Step 2: Finding required values __

Now, we have two equations and two variables. So, let’s solve them to get the value of y.

x + y = 1200 ……………… (1)

2x + 8y = 6000 ……………… (2)

Multiplying equation (1) by 2, and then subtracting it from equation (2), we get:

6y = 3600

Thus,y = 600

__Step 3: Calculating the final answer __

So, the number of 3-bedroom apartments = 600

**Answer: Option (B)**

QUESTION: 7

In a day care, 80% of the kids are American. 60% of the kids have started speaking. Of these, only 20% are under the age of 2 years. If the number of non-American kids at the day care is 40, what is the number of kids who can speak and are not under 2 years of age?

Solution:

__Step 1: Question statement and Inferences__

Let the total number of kids at the day care be N

So, number of American kids = 80% of N = 0.8N

Number of non-American kids = N-0.8N = 0.2N

It is given that 0.2N = 40

From here, we calculate that N = 200

__Step 2: Finding required values__

Number of kids who speak = 60% of N = 60% of 200 = 120

Of these, 20% are under 2 years of age.

Remaining 80% are not under 2 years of age

__Step 3: Calculating the final answer__

Number of kids who are not under 2 years of age = 80% of 120

= 96

Looking at the answer options, we see that option C is correct.

QUESTION: 8

If the students were awarded only three grades-A, B and C-how many students in the class got grade A?

(1) 20% of the class got grade B and 50% of the class got grade C.

(2) The 12 girls in the class make up 40% of the class.

a+b+c=T

Solution:

__Steps 1&2: Understand question and draw inferences__

This question involves the creation of two trees.

In the first tree, the node ‘Total Students’ is branched on the basis of gender. So, we get two branches: Girls and Boys.

Let the number of Girls in the class be g, and the number of boys in the class be b.

Let the total number of students in the class be T.

So, we can write:

g+b=T

. . . Equation 1

In the second tree, the node ‘Total Students’ is branched out on the basis of grades.

So, we get three branches: Grade A, Grade B and Grade C.

Let the number of students who got grades A, B and C be a, b and c respectively.

So, we can write:

a+b+c=T. . . Equation 2

We need to find the value of a.

__Step 3: Analyze Statement 1__

As per Statement 1,

20% of the class got grade B and 50% of the class got grade C

*b = 20% of T* *and c = 50% of T*

*⇒ b = 0.2T and c = 0.5T*

Substituting these values of b and c in Equation 2:

*a + 0.2T + 0.5T = T*

*a=0.3 T*

Since we don’t know the value of T, we will not be able to find the value of a.

Therefore, Statement 1 is not sufficient.

__Step 4: Analyze Statement 2__

As per Statement 2,

The 12 girls in the class make up 40% of the class

⇒ g=12

and g=40% of T

⇒ 12 = 40100T

⇒ T = 30

However, this statement gives us no clue about the value of a. Therefore, this statement is clearly not sufficient.

__Step 5: Analyze Statement 1 and Statement 2 together (if needed)__

From Statement 1,

*a=0.3 T*

From Statement 2,

*T = 30 *

Thus, by combining the two statements,

We get *a = 9*

Thus, we are able to get a unique value by combining the two statements.

**Correct Answer - Choice C**

QUESTION: 9

A premier Film and Performing Arts school has a total class strength of 770. Two-third of the male students and three-fourth of the female students have opted for acting courses. The remaining students have opted for other courses. If the number of female students who opted for other courses was 55 less, then there would be 2 male students who opted for other courses for every female student who opted for other courses. How many students have opted for the acting courses?

Solution:

__Step 1: Question statement and Inferences__

We are given that in a certain school, there are a total of 770 students. Let’s say the number of male students is x and the number of female students is y. So,

x + y = 770 …………… (1)

The number of male students in acting courses = 2x/3

The number of male students in other courses = x/3

The number of female students in acting courses = 3y/4

The number of female students in other courses = y/4

Thus,

The total number of students in acting courses =

And, the total number of students in other courses=

It is also given that, If there were 55 less female students who opted for other courses, then the number of male students who opted for other courses will be twice that of the female students who opted for other courses. So,

__Step 2: Finding required values __

Adding equations (1) and (4), we get y = 440 from which we can calculate x = 330.

__Step 3: Calculating the final answer __

Now, from equation (2),

The total number of students in acting courses

**Correct choice : D**

QUESTION: 10

A certain university spends all the money donated by The Goodwill Foundation in a certain year to fund three research projects P, Q and R. Project P receives a funding of $40,000. Both projects P and Q receive 100% more funding than Project R. The donation made by The Goodwill Foundation to the university is 25% of the total donation received by the university during the year. If the university invests in projects P, Q and R only from the money received from The Goodwill Foundation, then what is the total amount, in dollars, of donation that is not received by the university from The Goodwill Foundation?

Solution:

__Step 1: Question statement and Inferences__

The first step will be to draw the tree structure that depicts the question statement.

The next step will be to find the value at each node and branch of the tree.

**Step 2: Finding required values**

Let the money donated by The Goodwill Foundation be $x

It is given that

Amount donated by Goodwill Foundation =25% of Total Donation

Total Donation=4x

So, Donations by others=4x–x=3x

We need to find the value of

We are also given that

Funding received by P = Funding Received by Q = $40,000

Also,

Funding received by P= Funding received by R+100 of Funding received by R

Thus,x=40,000 + 40,000 + 20,000 = $100,000

__Step 3: Calculating the final answer__

Donation that is not received by the university from The Goodwill Foundation = 3x = $300,000

**(D) is the correct answer.**

QUESTION: 11

Mid-way through their MBA, the students of the Class of 2012 in a business school were surveyed for career preferences. One-third of the students chose consulting as their first preference. When the survey was repeated upon completion of the MBA, it was found that two-third of the students who earlier preferred consulting had changed their mind. Among the students who chose consulting in both the surveys, three-fifths became entrepreneurs and opened consulting startups and the remaining 12 joined consulting firms as employees. How many students did the Class of 2012 have?

Solution:

__Step 1: Question statement and Inferences__

Let the number of students in the Class of 2012 be x.

So, number of students who chose consultancy in the first survey = x/3.

Two-third out of the students who chose consultancy as their first career choice, changed their mind by the completion of the course.

So, the number of students who changed their mind

__Step 2: Finding required values __

Out of the students who chose consulting in the second survey as well, three-fifth started their careers as entrepreneurs and 12 as employee to firms.

The number of students who still chose consulting in the second survey =

The number of student who became entrepreneurs = 3/5 x The number of students who stayed with their first choice

The number of student who joined firms = 12

That is,

__Step 3: Calculating the final answer __

Thus, the total number of students in the class = 270.

**Answer: Option (D) **

QUESTION: 12

In an interview for a certain job, 120 candidates appeared and two questions were asked to each candidate. How many candidates did not answer any question correctly?

(1) Of all the candidates who appeared for the interview, 20% of the candidates who answered at least one question correctly, answered both questions correctly.

(2) Of all the candidates who appeared for the interview, 25% of the candidates who answered none or both questions correctly, answered both questions correctly.

Solution:

__Steps 1&2: Understand question and draw inferences__

Let the number of candidates who gave 0 correct answers, 1 correct answer and 2 correct answers = A, B and C respectively

A + B + C = 120 -----(1)

We have to find the value of A.

To do so, we need to find:

(i) Either the value of B and C

(ii) Or the value of (B + C)

**Step 3: Analyze Statement 1**

Number of students who answered at least one question correctly = B + C

We derive a relation between B and C, but we cannot find the value of B or C or (B + C) from equation (1) and (2).

INSUFFICIENT.

**Step 4: Analyze Statement 2**

Number of students who answered none or all questions correctly = A + C

We derive a relation between A and C, but we cannot find the value of B or C or (B + C) from equation (1) and (3).

__Step 5: Analyze Statement 1 and Statement 2 together (if needed)__

We have equations (1), (2) and (3) when we combine the two statements.

Substituting A and B from equation (2) and (3) in equation (1),

3C + 4C + C = 120

We can find the value of C from this equation and substitute the value in equation (3) the find the required value of A.

SUFFICIENT.

**(C) is the correct answer.**

QUESTION: 13

If 80% employees of a company play soccer, what percent of the employees play golf?

(1) 25% of the employees who play soccer also play golf.

(2) 50% of the employees who play golf also play soccer.

Solution:

__Steps 1 & 2: Understand Question and Draw Inferences__

We are given that 80% employees of a company play soccer. We have to find the percentage of the employees who play golf.

Since this question only talks about the percentage, not the absolute numbers, let’s say the number of employees in the company is 100.

80% of these employees play soccer. Now, these 80% employees include the employees who play only soccer and the employees who play soccer and golf both.

So, the employees who play soccer = 80% of 100 = 80

Let’s say the number of employees who play both soccer and golf = x

Thus, the number of employees who play only soccer = 80 – x

Also, let the number of employees who play only golf = y

If there are any employees who play neither soccer nor golf = 20 – y

The total number of employees who play golf = x + y

We have to find the value of (x + y).

__Step 3: Analyze Statement 1__

Statement (1) says: 25% of the employees who play soccer also play golf.

The number of employees who play soccer and golf is x.

Per this statement:

x = 25% of 80

x = 20 ………….. (1)

However, since we do not know the value of y, we cannot get the value of (x + y).

Hence, statement (1) is not sufficient to answer the question: What is the value of (x + y)?

__Step 4: Analyze Statement 2__

Statement (2) says: 50% of the employees who play golf also play soccer.

The employees who play golf and soccer are (x + y). 50% of these employees also play soccer. Out of these (x + y) employees, the employees who play soccer = x

50% of (x + y) = x

x + y = 2x

y = x …… (2)

However, we don’t know the value of x and y. so, we can’t determine the value of (x + y).

Hence, statement II is not sufficient to answer the question: What is the value of (x + y)?

__Step 5: Analyze Both Statements Together (if needed)__

Since step 3 and step 4 were not able to provide the answer to the question, let’s analyse both the statements together:

Statement (1):

x = 20 ………….. (1)

Statement (2):

y = x ………… (2)

Thus,

y = 20

Hence,

x + y = 20 + 20 = 40

So, statement (1) and (2) combined are sufficient to answer the question.

**Answer: Option (C) **

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