Question

ITE
(2) 13 yr
Average age of 5 boys is 13 yr. One more boy joins them and the average age becomes 12 yr.
of the boy who joins last is​

Answer 1

Answer:

7 years

Step-by-step explanation:

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Answer 2

Average age of 15 boys is 12.

Let S be the sum of ages of 15 boys

a = S/n

Here, a=12 and n=15

12 = S/15

S= 180

If 5 boys each of age 11 years are added,

New sum = S+ 5 x 11 = 180+55 = 235

Revised number of boys = 15+5 =20

New average = 235/20 = 11.75

Ans: 11.75 is the new average