A is twice as old as B. Ten years ago A was three times as old as B. What is B's present age?

  1. 30 years
  2. 20 years
  3. 15 years
  4. 10 years
Answer

B) 20 years

A = 2B and A - 10 = 3(B - 10) → 2B - 10 = 3B - 30 → B = 20.

Quantitative Reasoning MCQ · More Speed, Time, Work & Ages MCQs · Practise