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Question

12 workers can build a house in 30 days. If 15 workers build the same house, how many days will they need?
  1. 24
  2. 15
  3. 37.5
  4. 48


Solution

The correct option is A 24
If the number of workers building the house increases, the number of days required to build the house decreases.
 This is a case of inverse proportion.

Number of workers × Number of days = constant 12 × 30 = 15 × Number of days
 Number of days required = 12×3015 = 24.

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