The sum of the present ages of A, B and C is 90 years. Ten years ago, the ratio of their ages was 1 : 2 : 3. What is the present age of B?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 30 years
Ten years ago each of the three was 10 years younger, so the sum then was 30 years less. That sum is shared in the ratio 1 : 2 : 3.
Sum ten years ago \(=90-3\times10=60\) years
B ten years ago \(\displaystyle =\frac{2}{6}\times60=20\) years
B now \(=20+10=30\) years