| The average age of a husband and wife, who were married 4 yr ago, was 25 yr at the time of their marriage. The average age of family consisting of husband, wife and a child, born during the interval is 20 yr today. The age of child is [SSC (10+2) 2010] |
A) 1 yr
B) 2 yr
C) 2.5 yr
D) 3 yr
Correct Answer: B
Solution :
| Given, 4 yr ago, |
| Average age of husband and wife \[=25\,\,yr\] |
| Sum of ages of husband and wife 4 yr ago |
| \[=25\times 2=50\] |
| Sum of present ages of both \[=50+8=58\] |
| Average age of all three people \[=20\] |
| \[\therefore \]Sum of age of all three \[=20\times 3=60\] |
| \[\therefore \]Child's age\[=60-58=2\,\,yr\] |
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