Question

The average of the age of a husband and wife five years ago was $25$ years. The average of the present age of husband, wife, and a child born during the time is $21$ years. Determine the present age of the child.

• A. $1$ year
• B. $2$ years
• C. $3$ years
• D. $4$ years

Answer 1

Answer: (C)

$3$ years

Sum of the ages of husband and wife $5$ years ago $=2\times 25=50$ years
Sum of the ages of husband and wife at present $=50+5+5=60$ years
Sum of the ages of husband wife and child at present $=3\times 21=63$ years
Therefore, present age of the child $=(63-60)$ years $=3$ years