WAEC Mathematics 2018 Theory — Question 3

Question 3 of 23 from the West African Examinations Council (WAEC) Mathematics 2018 Theory paper, with the correct answer and a full explanation.

2.(a) Musa is three years older than Manya. Seven years ago, Musa was twice as old as Manya. How old are they now?

Model answer

Let Musa=x, Manya=y. x=y+3 …(1). x−7=2(y−7) → x=2y−7 …(2). Equating: y+3=2y−7 → y=10, x=13. Musa is 13 years old, Manya is 10 years old.

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