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JAMB Mathematics 2005 Question 15

Question 15

Variation

The time taken to do a piece of work is inversely proportional to the number of men employed. If it takes 30 men to do a piece of work in 6 days, how many men are required to do the work in 4 days?

  1. A.20
  2. B.35
  3. C.45
  4. D.60
Show the answer and explanation

Answer: C (45)

Explanation

Men × days is constant: 30 × 6 = 180, so 180 ÷ 4 = 45 men.