Correct Answer - Option 5 : 12 yrs
Given:
The average age of a family of 5 members 3 years ago = 27 yrs
Present average age of the family changes after a child is included = 27 yrs
Calculation:
Total age of 5 members (3 years ago) = 27 × 5 = 135.
⇒ Total age of 5 members (at present) = 135 + 5 × 3 = 150
⇒ Let the present age of child be x.
⇒ 27 = (150 + x)/6
⇒ x = 162 – 150 = 12 yrs.
∴ Present age of the child is 12 years.
