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WAEC Mathematics 2023 Question 7

Question 7

Linear and Simultaneous Equations

Mr. Manu is 4 times as old as his son, Adu. 7 years ago, the sum of their ages was 76 years. How old is Adu?

  1. A.12 years
  2. B.15 years
  3. C.18 years
  4. D.22 years
Show the answer and explanation

Answer: C (18 years)

Explanation

Let Adu be a, so Manu is 4a. Seven years ago: (4a − 7) + (a − 7) = 76, so 5a = 90 and a = 18.