## Number of days the project delayed

**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?

A. 5 | C. 6 |

B. 3 | D. 4 |

**Answer Key**

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