WAEC Mathematics 2020 Objective — Question 16
Question 16 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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Given that x is directly proportional to y and inversely proportional to Z, x = 15 when y = 10 and z = 4, find the equation connecting x, y and Z.
- A. x = 6y/ZCorrect
- B. x = 12y/Z
- C. x = 3y/Z
- D. x = 3y/2Z
Explanation
x = ky/z. Substituting the given values: 15 = k(10)/4, so k = 15x4/10 = 6. Thus the equation is x = 6y/z.
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