Question

6. The average age of a husband and
a wife was 27 yr, when they
married 4 yr ago. The average age
of the husband, the wife and a new
born child is 21 yo now. The
present age of the child is
(1) 4 yr
(2) 3 yr
(3) 2 yr
(4) 1 yr​

Answer 1

Answer:

Given that, 4yrs. back, the average age of a couple=25yrs.

Then, the total==25×2yrs.=50yrs.

After 4yrs. the sum will increase by 4×2yrs.=8yrs.

Let the child's age=xyrs.

Then the toal age of the family=(50+8+x)yrs=(58+x)yrs.

Then, by the given condition,

$\frac{58 + x}{3} = 20$

⟹58+x=60

⟹x=2yrs.

Hence option No 3 is correct

Answer 2

option 1) is correct.

if 4 years ago a child is born , i.e, its age is 0 yrs

so; after 4 years its age will be 4 yrs obviously