1.

three years ago the average age of a family of 5 members was 17 years. in spite of the birth of a child in the family the present average of the family remains the same. the present age of a child is

Answer»

Average = (TOTAL quantity)/(No. of quantities)

So,

LET the present age of the child be x

Now, three years back, the average age of FAMILY was 17

So,

Total age = 17×5 = 85 years

Now,

The present age average is still 17

So, in three years the individual age of the members will also increase

Increase in age of five family members = 5×3 = 15

So,

By present,

(15+85+x)/6 = 17

x=102 - 100

x=2

So,

The present age of the child is 2 years


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