Multiple choice

The average age of A and B is 45 years. The ratio of their age is 2 : 1 respectively. What is the B's age?

  1. 20 years

  2. 25 years

  3. 30 years

  4. 35 years

  5. 15 years
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The average age of A and B is 45 years, so their total age is 45 × 2 = 90 years. Given their age ratio is 2:1, let A's age be 2x and B's age be x. Then 2x + x = 90, which gives 3x = 90, so x = 30. Therefore, B's age is 30 years. Option A (20 years) is incorrect as it would make the total 60 years, not 90. Option B (25 years) would give a total of 75 years. Option D (35 years) for B would make A 70 years, totaling 105 years.

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