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A swimming bath is 24 m long and 15 m broad. When a number of men drive into the bath. The height of water rises by 1cm. If the average volume of water displaced by each man be 0.1m3 how many mean are there in the both?

Correct answer: B. 36

  • A. 32
  • B. 36
  • C. 42
  • D. 46

Explanation

A 1 cm rise equals 0.01 m, so the displaced water volume is 24 m × 15 m × 0.01 m = 3.6 m3. Dividing by the average displacement per man gives 3.6 m3 ÷ 0.1 m3 per man = 36 men. The likely wrong choice is 32 men, caused by using an incorrect bath area or treating 1 cm as 1 m.

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