Multiple choice

The present age of mother and daughter are in the ratio of 8:3. After 12 years, ratio of their ages will be 2:1. What is the sum of the present age of mother and daughter?

  1. 71 year

  2. 66 year

  3. 69 year

  4. 74 year

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let present ages be 8x and 3x. After 12 years, (8x + 12)/(3x + 12) = 2/1. Solving gives x = 6, so mother is 48 and daughter is 18. Sum = 66 years. The key is maintaining the ratio relationship over time.