Multiple choice

A’s age is three times of B’s age. Ten years ago A was five times of B’s age. What is A’s present age?

  1. 50

  2. 60

  3. 70

  4. 80
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let B's present age = x. Then A's age = 3x. Ten years ago: A-10 = 5(B-10), so 3x-10 = 5x-50. Solving: 2x = 40, x = 20. Therefore A's present age = 3×20 = 60. The key is setting up the equation from both the current and past relationships.

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