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JAMB Mathematics 1991 Question 7

Question 7

Ratio, Percentages and Rates

If 3 gallons of spirit containing 20% water are added to 5 gallons of another spirit containing 15% water, what percentage of the mixture is water?

  1. A.2 4/5%
  2. B.16 7/8%
  3. C.18 1/8%
  4. D.18 7/8%
Show the answer and explanation

Answer: B (16 7/8%)

Explanation

Water = 20% of 3 + 15% of 5 = 0.6 + 0.75 = 1.35 gallons out of 8 gallons. 1.35/8 × 100 = 16⅞%.