Problem A contractor estimates that he could finish a project in 15 days if he has 20 men. At the start, he hired 10 men then after 6 days, 10 more men are added. How many days was the project delayed?

Answer Key

Solution

$10(6) + 20x = 300$

$x = 12 ~ \text{ days}$

$\text{Actual duration } = 6 + x = 18 ~ \text{ days}$

The project was delayed by 3 days.

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