Question

The average age of 5 boys is 13 years. One more boy joins them and the average age becomes 12 years. Find the age of the boy who joins?

Answer 1

Hey Buddy

Here's The Answer

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We know Average ( Avg )

=> Avg = Net total / number

A.T.Q.

=>( Sum of ages of 5 boys ) / 5 =13

=> Sum of ages of 5 boys = 13 × 5

=> Sum of ages of 5 boys = 65

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# Now a boy is added of age ( x ) and average becomes 12

=> Total sum of ages / no = 12

=> ( Sum of ages of 5 boys + sixth boy )/ 6 = 12

=> ( 65 + x ) / 6 = 12

=> 65 + x = 72

=> x = 72 - 65

=> x = 7 years

# Age of sixth boy is 7 years

HOPE HELPED

JAI HIND

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Answer 2

sum of 5 boys age = S

Avg = S / 5

13 = S/5

S = 65

after sixth boy joins

total sum of age = S + x

65 + x

now

avg = ( 65 + x )/6

ATQ

(65+ x ) / 6 = 12

x + 65 = 72

x = 7 yrs