SSC Exam > SSC Questions > The average age of the boys in a class of 20 ...
Start Learning for Free
The average age of the boys in a class of 20 boys is 15.6 years. What will be the average age if 5 new boys come whose average is 15.4 years?
- a)15.56 yrs
- b)15.65 yrs
- c)18 yrs
- d)16.56 yrs
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
The average age of the boys in a class of 20 boys is 15.6 years. What ...
We have, Average age = Sum of all ages/No. of persons
∴ 15.6 = Sum of 20 boys ages/ 20
⇒ Sum of ages of 20 boys = 20 × 15.6 = 312
After 5 new boys come, total boys = 20 + 5 = 25
Sum of ages of 5 new boys = 15.4 × 5 = 77
Sum of 25 boys ages = 312 + 77 = 389
Overall average = 389/25 = 15.56 yrs.
∴ 15.6 = Sum of 20 boys ages/ 20
⇒ Sum of ages of 20 boys = 20 × 15.6 = 312
After 5 new boys come, total boys = 20 + 5 = 25
Sum of ages of 5 new boys = 15.4 × 5 = 77
Sum of 25 boys ages = 312 + 77 = 389
Overall average = 389/25 = 15.56 yrs.
Most Upvoted Answer
The average age of the boys in a class of 20 boys is 15.6 years. What ...
Given information:
- Number of boys in the class = 20
- Average age of the boys in the class = 15.6 years
To find:
- Average age if 5 new boys join the class, with an average age of 15.4 years.
Let's solve this step by step:
Step 1: Find the sum of the ages of the existing boys.
- Average age = Sum of ages of all boys / Total number of boys
- Sum of ages of all boys = Average age * Total number of boys
- Sum of ages of all boys = 15.6 * 20 = 312 years
Step 2: Find the sum of ages of the new boys.
- Average age of the new boys = 15.4 years
- Sum of ages of the new boys = Average age of the new boys * Number of new boys
- Sum of ages of the new boys = 15.4 * 5 = 77 years
Step 3: Find the total sum of ages after the new boys join.
- Total sum of ages = Sum of ages of existing boys + Sum of ages of new boys
- Total sum of ages = 312 + 77 = 389 years
Step 4: Find the new average age.
- New average age = Total sum of ages / Total number of boys
- New average age = 389 / (20 + 5) = 389 / 25 = 15.56 years
Therefore, the average age of the boys after the new boys join is 15.56 years.
- Number of boys in the class = 20
- Average age of the boys in the class = 15.6 years
To find:
- Average age if 5 new boys join the class, with an average age of 15.4 years.
Let's solve this step by step:
Step 1: Find the sum of the ages of the existing boys.
- Average age = Sum of ages of all boys / Total number of boys
- Sum of ages of all boys = Average age * Total number of boys
- Sum of ages of all boys = 15.6 * 20 = 312 years
Step 2: Find the sum of ages of the new boys.
- Average age of the new boys = 15.4 years
- Sum of ages of the new boys = Average age of the new boys * Number of new boys
- Sum of ages of the new boys = 15.4 * 5 = 77 years
Step 3: Find the total sum of ages after the new boys join.
- Total sum of ages = Sum of ages of existing boys + Sum of ages of new boys
- Total sum of ages = 312 + 77 = 389 years
Step 4: Find the new average age.
- New average age = Total sum of ages / Total number of boys
- New average age = 389 / (20 + 5) = 389 / 25 = 15.56 years
Therefore, the average age of the boys after the new boys join is 15.56 years.
|
Explore Courses for SSC exam
|
|
Similar SSC Doubts
The average age of the boys in a class of 20 boys is 15.6 years. What will be the average age if 5 new boys come whose average is 15.4 years?a)15.56 yrsb)15.65 yrsc)18 yrsd)16.56 yrsCorrect answer is option 'A'. Can you explain this answer?
Question Description
The average age of the boys in a class of 20 boys is 15.6 years. What will be the average age if 5 new boys come whose average is 15.4 years?a)15.56 yrsb)15.65 yrsc)18 yrsd)16.56 yrsCorrect answer is option 'A'. Can you explain this answer? for SSC 2024 is part of SSC preparation. The Question and answers have been prepared according to the SSC exam syllabus. Information about The average age of the boys in a class of 20 boys is 15.6 years. What will be the average age if 5 new boys come whose average is 15.4 years?a)15.56 yrsb)15.65 yrsc)18 yrsd)16.56 yrsCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for SSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The average age of the boys in a class of 20 boys is 15.6 years. What will be the average age if 5 new boys come whose average is 15.4 years?a)15.56 yrsb)15.65 yrsc)18 yrsd)16.56 yrsCorrect answer is option 'A'. Can you explain this answer?.
The average age of the boys in a class of 20 boys is 15.6 years. What will be the average age if 5 new boys come whose average is 15.4 years?a)15.56 yrsb)15.65 yrsc)18 yrsd)16.56 yrsCorrect answer is option 'A'. Can you explain this answer? for SSC 2024 is part of SSC preparation. The Question and answers have been prepared according to the SSC exam syllabus. Information about The average age of the boys in a class of 20 boys is 15.6 years. What will be the average age if 5 new boys come whose average is 15.4 years?a)15.56 yrsb)15.65 yrsc)18 yrsd)16.56 yrsCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for SSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The average age of the boys in a class of 20 boys is 15.6 years. What will be the average age if 5 new boys come whose average is 15.4 years?a)15.56 yrsb)15.65 yrsc)18 yrsd)16.56 yrsCorrect answer is option 'A'. Can you explain this answer?.
Solutions for The average age of the boys in a class of 20 boys is 15.6 years. What will be the average age if 5 new boys come whose average is 15.4 years?a)15.56 yrsb)15.65 yrsc)18 yrsd)16.56 yrsCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for SSC.
Download more important topics, notes, lectures and mock test series for SSC Exam by signing up for free.
Here you can find the meaning of The average age of the boys in a class of 20 boys is 15.6 years. What will be the average age if 5 new boys come whose average is 15.4 years?a)15.56 yrsb)15.65 yrsc)18 yrsd)16.56 yrsCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
The average age of the boys in a class of 20 boys is 15.6 years. What will be the average age if 5 new boys come whose average is 15.4 years?a)15.56 yrsb)15.65 yrsc)18 yrsd)16.56 yrsCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for The average age of the boys in a class of 20 boys is 15.6 years. What will be the average age if 5 new boys come whose average is 15.4 years?a)15.56 yrsb)15.65 yrsc)18 yrsd)16.56 yrsCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of The average age of the boys in a class of 20 boys is 15.6 years. What will be the average age if 5 new boys come whose average is 15.4 years?a)15.56 yrsb)15.65 yrsc)18 yrsd)16.56 yrsCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice The average age of the boys in a class of 20 boys is 15.6 years. What will be the average age if 5 new boys come whose average is 15.4 years?a)15.56 yrsb)15.65 yrsc)18 yrsd)16.56 yrsCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice SSC tests.
|
|
Explore Courses for SSC exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup