Question

the average of 7 boys is 15 years one more boy join them and the average now becomes 14 years .Find the age of the boy who joins last​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

Average of 14 boys= 15

x/7= 15

x= 105

let the age of the new boy be y, now the total is also increased by 1 , 7+1= 8

we have,

(105+y)/8= 14

105+y= 112

y= 112-105= 7

the age of the new boy is 7 years.