Number of days the project delayed Date of Exam May 2016 Subject Mathematics, Surveying and Transportation Engineering 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 Click here to show or hide the answer key [ B ] Solution Click here to expand or collapse this section $\text{Work load } ~ = 20(15) = 300 ~ \text{ man-days}$ $10(6) + 20x = 300$ $x = 12 ~ \text{ days}$ $\text{Actual duration } = 6 + x = 18 ~ \text{ days}$ The project was delayed by 3 days. Category College Algebra Work Problem man-days Log in or register to post comments