Multiple choice

12 persons can do a piece of work in 4 days. How many persons are required to complete 8 times the work in half the time?

  1. $192$
  2. $190$
  3. $180$
  4. $144$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Work is proportional to both persons and time. Original work requires 12 × 4 = 48 person-days. For 8 times the work (384 person-days) in half the time (2 days), divide total work by time: 384 ÷ 2 = 192 persons.

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