3 years ago, an elder sister was twice her younger brother’s age. The brother is 19 now. How old is the sister now?

Question: 3 years ago, an elder sister was twice her younger brother’s age. The brother is 19 now. How old is the sister now?

1. 36 years
2. 35 years
3. 34 years
4. 37 years

Correct Answer: B — 35 years

Explanation: Sister’s past age was twice brother’s past age; add elapsed years.
Sister now = 2(19 − 3) + 3 = 35 years.