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If X = 80% of Y and Z = 120% of X, the ratio X : Y : Z is:

Question: If X = 80% of Y and Z = 120% of X, the ratio X : Y : Z is:
  • A. 10:26:30
  • B. 10:15:20
  • C. 20:25:24 ✓
  • D. 10:25:23
Correct Answer: C. 20:25:24
Explanation: Given X = 0.8Y and Z = 1.2X ⇒ X:Y:Z = 0.8Y:Y:0.96Y ⇒ multiply by 25 ⇒ 20:25:24 (solution shown in your notes).

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