An engineer undertakes a project to build a road 10 km long in 150 days and employs 30 men for the purpose. After 50 days, he finds only 2 km of the road has been completed. Find the (approximate) number of extra men he must employ to finish the work in time.
Select: A) 22 B) 30 C) 15 D) 18 E) 20
30 workers working already   Let x be the total men required to finish the task in next 100 days   2 km done hence remaining is 8 km   Also, work has to be completed in next 100 days (150 - 50 = 100)   We know that, proportion of men to distance is direct proportion   and, proportion of men to days is inverse proportion   Hence, X = (30 * 8 * 50) / (2 *100)   thus, X = 60   Thus, more men needed to finish the task = 60-30= 
<gadget id="calculator">60-30</gadget>
<output>30</output>
30   Answer : 30
<result>B</result>
An engineer undertakes a project to build a road 10 km long in 150 days and employs 30 men for the purpose. After 50 days, he finds only 2 km of the road has been completed. Find the (approximate) number of extra men he must employ to finish the work in time.