Multiple choice

15 men take 20 days to complete a job, working 8 hours a day. How many hours a day should 20 men work to complete the job in 12 days?

  1. 5 hours

  2. 10 hours

  3. 15 hours

  4. 18 hours
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Using the formula (M1*D1*H1) = (M2*D2*H2): 15 * 20 * 8 = 20 * 12 * H2. 2400 = 240 * H2, so H2 = 10.

AI explanation

Using the formula M1D1H1 = M2D2H2, we substitute the given values as 15 multiplied by 20 multiplied by 8 equals 20 multiplied by 12 multiplied by the required hours. This simplifies to 2400 = 240 multiplied by the required hours. Dividing 2400 by 240 gives the required daily working hours as 10.

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