Eight years ago, the average age of a husband, his wife and their child was 42 years. Nine years ago, the average age of the husband and the wife was 52 years. What is the present age of the child?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 28 years
Bring both totals to the present by adding the years passed for every person counted, then subtract.
Total of the three, eight years ago \(=3\times42=126\); today \(=126+3\times8=150\) years
Total of husband and wife, nine years ago \(=2\times52=104\); today \(=104+2\times9=122\) years
Child today \(=150-122=28\) years