Multiple choice

Fifteen men can do a piece work in 20 days. How many days will ten men take to do double the same work?

  1. 40

  2. 60

  3. 50

  4. 30
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Using the formula (M1 * D1) / W1 = (M2 * D2) / W2. (15 * 20) / 1 = (10 * D2) / 2. 300 = 5 * D2, so D2 = 60.

AI explanation

Using the formula of man-days, the total work is 15 men multiplied by 20 days, which equals 300 units. The new amount of work is double this value, so it is 600 units. Dividing this total work by 10 men gives 600 divided by 10, which equals 60 days.

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