The average age of 80 boys in a class is 15 years. The average age of a group of 15 boys in the class is 16 years and the average age of another 25 boys in the class is 14 years.What is the average age of the remaining boys in the class ?

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BANK PO Exam (Corporation Bank) 2010 click here to view all questions

The average age of 80 boys in a class is 15 years. The average age of a group of 15 boys in the class is 16 years and the average age of another 25 boys in the class is 14 years.What is the average age of the remaining boys in the class ?

A15.25 years

B14 years

C14.75 years

DCannot be determined

Akilesh Kharvi ? May 20 '2017 at 12:31

Answer is : 15.25 years

Explanation:

Let the required average age be x years.

\(80 × 15 = 15 × 16 + 25 × 14 + 40 × x\)

\(=> 40x =1200 - 240 - 350 = 610\)

\(x = \frac{610}{40}\)

= 15.25 years

 

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Answer is : 15.25 years Explanation: Let the required average age be x years. \(80 × 15 = 15 × 16 + 25 × 14 + 40 × x\) \(=> 40x =1200 - 240 - 350 = 610\) \(x = \frac{610}{40}\) = 15.25 years   Akilesh Kharvi ? answered May 20 '2017 at 12:31 All Comments

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