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JAMB Mathematics 1989 Question 7

Question 7

Ratio, Percentages and Rates

If a : b = 5 : 8, x : y = 25 : 16, evaluate a/x : b/y

  1. A.125 : 128
  2. B.3 : 5
  3. C.3 : 4
  4. D.2 : 5
Show the answer and explanation

Answer: D (2 : 5)

Explanation

(a/x) ÷ (b/y) = (a/b) × (y/x) = 5/8 × 16/25 = 2/5. So the ratio is 2 : 5.