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If 10 bulls can plough 20 identical fields in 3 days working 10 hours a day, then in how many days can 30 bulls plough 32 same identical fields working 8 hours a day?

Correct answer: A. 2

  • A. 2
  • B. 8
  • C. 10
  • D. 12

Explanation

The original labour is 10 bulls x 3 days x 10 hours = 300 bull-hours for 20 fields, or 15 bull-hours per field. For 32 fields, the work is 32 x 15 = 480 bull-hours; 30 bulls working 8 hours daily provide 240 bull-hours per day, so the time is 480/240 = 2 days. The likely mistake is 8 days, which fails to adjust for both the increased number of bulls and the shorter working day.

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