Problems on Ages

JKSSB Sub-Inspector (Executive) · Mathematics · 12 practice questions with answers and explanations: 2 Easy, 6 Medium, 4 Hard.

Sample questions

Sample Easy question 1

A father is four times as old as his son. If the sum of their ages is 50 years, how old is the son?

  1. 12
  2. 8
  3. 40
  4. 10
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Answer: D. Son = x, father = 4x. 5x = 50, so x = 10.

Sample Medium question 2

The average age of three persons is 24 years. If two of them are 20 and 26 years old, find the age of the third.

  1. 28
  2. 22
  3. 26
  4. 30
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Answer: C. Total = 3 × 24 = 72. Third = 72 − (20 + 26) = 26.

Sample Hard question 3

The present ages of A and B are in the ratio 4 : 5. Six years later the ratio will be 5 : 6. Find A's present age.

  1. 20
  2. 32
  3. 24
  4. 30
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Answer: C. (4k + 6)/(5k + 6) = 5/6 → 24k + 36 = 25k + 30 → k = 6. A = 4k = 24.

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