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Home » In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, find B’s present age.

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In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, find B’s present age.

A. 35 years
B. 37 years
C. 39 years ✅
D. 41 years

Explanation

  • A = B + 9
  • (A + 10) = 2(B - 10)
  • (B + 9 + 10) = 2B - 20
  • B + 19 = 2B - 20
  • B = 39 years