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Home » The ratio of ages of A and B is 3:4. After 5 years, the ratio becomes 4:5. Find A’s present age.

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The ratio of ages of A and B is 3:4. After 5 years, the ratio becomes 4:5. Find A’s present age.

A. 10 years
B. 15 years ✅
C. 20 years
D. 25 years

Explanation

  • Let ages be 3k and 4k
  • After 5 years: (3k+5)/(4k+5) = 4/5
  • 15k + 25 = 16k + 20
  • k = 5
  • A's age = 3 x 5 = 15 years