Ratio & Proportion · Question 29 · Hard
x varies directly as y and inversely as z. When y = 12 and z = 4, x = 9. What is x when y = 20 and z = 6?
- 15
- 22.5
- 10
- 7.5
Answer and explanation
Answer: C. 10
Explanation: x = ky/z. From 9 = 12k/4, k = 3. So x = 3 × 20/6 = 10.
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