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The Venn Diagrams from the logical reasoning section would enhance your rational thinking skills. Take the practice test at jagranjosh.com to prepare for various entrances such as CAT, CMAT, MAT, XAT, IIFT, SNAP etc.**Directions (1 -4): **Read the following information and answer the questions below.

In a coaching institute there are total 170 students and they studied different subject’s viz. Economics, Maths and English.

The ratio of students studying all 3 subjects to students studying at least 2 subjects is 2:9. The ratio of students studying only one subject to students studying at least 2 subjects is 8:9.

Number of students taking Maths only exceeds number of students of Economics only by 14.

Number of students studying English only exceeds number of students of Economics only by 12. Number of students studying English, Economics, and Maths is 90, 93, 97 respectively.**1. Number of students studying all three subjects is:****a) **18**b) **12**c) **20**d) **None of these**Answer:** c**Explanation:**

a+b+c = α, x+y+z = β, k = γ

α+β+γ= 170

α + 2β + 3γ = 90 + 93 + 97 = 280

γ:(β+γ)= 2:9

⇒ γ : β = 2 : 7

and α:(β+γ) = 8 : 9

⇒ α:β:γ = 8 : 7 : 2

∴ α = 80, β = 70 and γ = 20

⇒ a+b+c = 80, x+y+ z = 70 ...(1)

and k = 20

Again c - b =14 and a - b = 12 ...(2)

On solving eq. (1) and (2) we get a = 30, b = 18, c = 32

Again (a +x +k + z) - (a+k) = (x + z)

= 90 - (30 + 20) = 40

and (x + y + z) - (x + z) = y =70 - 40 = 30

Similarly x = 25 and z = 15**2. Number of students studying no more than one subject is:****a) **76**b) **80**c) **60**d) **can’t be determined**Answer:** b**Explanation:**

a+b+c = α, x+y+z = β, k = γ

α+β+γ= 170

α + 2β + 3γ = 90 + 93 + 97 = 280

γ:(β+γ)= 2:9

⇒ γ : β = 2 : 7

and α:(β+γ) = 8 : 9

⇒ α:β:γ = 8 : 7 : 2

∴ α = 80, β = 70 and γ = 20

⇒ a+b+c = 80, x+y+ z = 70 ...(1)

and k = 20

Again c - b =14 and a - b = 12 ...(2)

On solving eq. (1) and (2) we get a = 30, b = 18, c = 32

Again (a +x +k + z) - (a+k) = (x + z)

= 90 - (30 + 20) = 40

and (x + y + z) - (x + z) = y =70 - 40 = 30

Similarly x = 25 and z = 15**3. Number of students using exactly two subjects is:****a) **38**b) **55**c) **70**d) **none of these**Answer:** c**Explanation:**

a+b+c = α, x+y+z = β, k = γ

α+β+γ= 170

α + 2β + 3γ = 90 + 93 + 97 = 280

γ:(β+γ)= 2:9

⇒ γ : β = 2 : 7

and α:(β+γ) = 8 : 9

⇒ α:β:γ = 8 : 7 : 2

∴ α = 80, β = 70 and γ = 20

⇒ a+b+c = 80, x+y+ z = 70 ...(1)

and k = 20

Again c - b =14 and a - b = 12 ...(2)

On solving eq. (1) and (2) we get a = 30, b = 18, c = 32

Again (a +x +k + z) - (a+k) = (x + z)

= 90 - (30 + 20) = 40

and (x + y + z) - (x + z) = y =70 - 40 = 30

Similarly x = 25 and z = 15**4. The number of students who are studying both Economics and Maths but not English is:****a) **23**b) **40**c) **36**d) **data insufficient**Answer:** b**Explanation:**

a+b+c = α, x+y+z = β, k = γ

α+β+γ= 170

α + 2β + 3γ = 90 + 93 + 97 = 280

γ:(β+γ)= 2:9

⇒ γ : β = 2 : 7

and α:(β+γ) = 8 : 9

⇒ α:β:γ = 8 : 7 : 2

∴ α = 80, β = 70 and γ = 20

⇒ a+b+c = 80, x+y+ z = 70 ...(1)

and k = 20

Again c - b =14 and a - b = 12 ...(2)

On solving eq. (1) and (2) we get a = 30, b = 18, c = 32

Again (a +x +k + z) - (a+k) = (x + z)

= 90 - (30 + 20) = 40

and (x + y + z) - (x + z) = y =70 - 40 = 30

Similarly x = 25 and z = 15**Directions (5 - 7): **Read the following information and answer the questions below.

50 students sing, 60 students do not dance and 25 students do both in a class of 100 students.**5. How many students neither sing nor dance?****a)** 65**b)** 35**c)** 15**d)** Cannot be determined**Answer:** b** Explanation: **Students who neither sing nor dance = Total students – Students who do sing alone, dance alone and do both

From Venn diagram, Students who neither sing nor dance = 100 - (25+25+15) = 35

(See the Venn diagram and explanation at the end of the questions)

Given,

Total students = 100

Number of students who sing = 50

Number of students who do not dance = 60

So, number of students who dance = 100-60= 40 (Total students- Students who do not dance)

Students who dance and sing = 25 (Overlapping portion in the Venn diagram)

Number of students who sing alone = 50-25 = 25 (Students who sing- Students who sing and dance)

Number of students who dance alone= 40-25 = 15 (Students who dance- Students who sing and dance)

From Venn diagram, Students who neither sing nor dance = 100 - (25+25+15) = 35

(See the Venn diagram and explanation at the end of the questions)

Given,

Total students = 100

Number of students who sing = 50

Number of students who do not dance = 60

So, number of students who dance = 100-60= 40 (Total students- Students who do not dance)

Students who dance and sing = 25 (Overlapping portion in the Venn diagram)

Number of students who sing alone = 50-25 = 25 (Students who sing- Students who sing and dance)

Number of students who dance alone= 40-25 = 15 (Students who dance- Students who sing and dance)

From Venn diagram, Students who neither sing nor dance = 100 - (25+25+15) = 35

(See the Venn diagram and explanation at the end of the questions)

Given,

Total students = 100

Number of students who sing = 50

Number of students who do not dance = 60

So, number of students who dance = 100-60 = 40 (Total students- Students who do not dance)

Students who dance and sing = 25 (Overlapping portion in the Venn diagram)

Number of students who sing alone = 50-25 = 25 (Students who sing- Students who sing and dance)

Number of students who dance alone = 40-25 = 15 (Students who dance- Students who sing and dance)

There are 120 employees who work for Airtel Pvt. Ltd. Mumbai, out of which 50 are women. Also:

Total number of employees = 120

Women = 50

Men = 70

Married workers = 56

Graduate workers = 52

a → unmarried men who are not graduate

b → married women who are not graduate

c → unmarried women who are graduate

x → married men who are not graduate

y → married women who are graduate

z → unmarried men who are graduate

k → married men who are graduate

p → unmarried women who are not graduate

According to the given information the Venn diagram can be completed as given below.

Total number of employees = 120

Women = 50

Men = 70

Married workers = 56

Graduate workers = 52

a → unmarried men who are not graduate

b → married women who are not graduate

c → unmarried women who are graduate

x → married men who are not graduate

y → married women who are graduate

z → unmarried men who are graduate

k → married men who are graduate

p → unmarried women who are not graduate

According to the given information the Venn diagram can be completed as given below.

Total number of employees = 120

Women = 50

Men = 70

Married workers = 56

Graduate workers = 52

a → unmarried men who are not graduate

b → married women who are not graduate

c → unmarried women who are graduate

x → married men who are not graduate

y → married women who are graduate

z → unmarried men who are graduate

k → married men who are graduate

p → unmarried women who are not graduate

According to the given information the Venn diagram can be completed as given below.

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