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JAMB Mathematics 1988 Question 6

Question 6

Ratio, Percentages and Rates

A basket contains green, black and blue balls in the ratio 5:2:1. If there are 10 blue balls, find the corresponding new ratio when 10 green and 10 black balls are removed from the basket.

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

Answer: D (4:1:1)

Explanation

With 10 blue balls there are 50 green and 20 black. Removing 10 green and 10 black leaves 40 : 10 : 10 = 4 : 1 : 1.