WAEC Mathematics 2025 Theory — Question 9

Question 9 of 19 from the West African Examinations Council (WAEC) Mathematics 2025 Theory paper, with the correct answer and a full explanation.

9(a). Mrs. Otoo spends ¹⁄₉ of her monthly salary on rent, ¹⁄₂ on food, ¹⁄₄ on clothes and still had $195.00 left. How much does she earn in a month?

Model answer

Amount spent = 1/9 + 1/2 + 1/4 = 31/36 Amount left = 1 − 31/36 = 5/36 (5/36) × salary = $195 Salary = 195 × 36/5 = $1,404.00

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