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11 years ago, Ali was three times Bilal’s age. Now Ali is twice Bilal’s age. How old is Bilal now?

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Question: 11 years ago, Ali was three times Bilal’s age. Now Ali is twice Bilal’s age. How old is Bilal now?

  1. 23 years
  2. 21 years
  3. 22 years
  4. 24 years

Correct Answer: C — 22 years

Explanation: If current ages are 2x and x, the past relation is 2x − t = 3(x − t).
2x − 11 = 3(x − 11), so x = 22 years.

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