Multiple choice

Some boys do a job in 9 days but 5 of them were absent and remaining boys did the work in 12 days. The original number of boys was-

  1. 15

  2. 20

  3. 18

  4. 10

  5. 19
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let original boys = x. Work = x×9 (boy-days). When 5 absent: (x-5)×12 = x×9. 12x - 60 = 9x. 3x = 60. x = 20.

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