Question

..
H. 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
last ?
(A) 12 years
(B) 13 years
(C) 14 years
(D) 7 years
The yerage eypenditure of a man for first
Exan
number o
12​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

average of 5 boys = 13

sum of 5 boys = 13×5= 65

one boy = x years joined

sum of 6 boys = 65+x

average of 6 boys = 12years

sum of 6 boys = 12×6=72

65+x = 72

x = 72-65 = 7years