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WAEC Mathematics 1993 Question 5

Question 5

Ratio, Percentages and Rates

A stick of length 1.75m was measured by a boy as 1.80m. Find the percentage error in his measurement

  1. A.2 7/9%
  2. B.2 6/7%
  3. C.5%
  4. D.27 7/9%
  5. E.28 4/7%
Show the answer and explanation

Answer: B (2 6/7%)

Explanation

Error = 1.80 − 1.75 = 0.05m. Percentage error = 0.05/1.75 × 100 = 20/7 = 2 6/7%.