WAEC Mathematics 2020 Objective — Question 13
Question 13 of 50 from the West African Examinations Council (WAEC) Mathematics 2020 Objective paper, with the correct answer and a full explanation.
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Solve: (1/3)(5-3x) < (2/5)(3-7x).
- A. x > 7/22
- B. x < 7/22
- C. x > -7/27
- D. x < -7/27Correct
Explanation
Multiplying through by 15 (LCM of 3,5): 5(5-3x) < 3(2)(3-7x) => 25-15x < 18-42x. Collecting terms: -15x+42x < 18-25 => 27x < -7 => x < -7/27.
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