JAMB Mathematics 1979 Question 34

Question 34

Ratio, Percentages and Rates

12 men complete a job in 9 days. How many men working at the same rate, would be required to complete the job in 6 days?

  1. A.24
  2. B.18
  3. C.12
  4. D.9
  5. E.8.
Show the answer and explanation

Answer: B (18)

Explanation

The job takes 12 × 9 = 108 man-days. Done in 6 days it needs 108 ÷ 6 = 18 men.