An engineer undertakes a project to build a road 10 km long in 30 days and employs 30 men for the purpose. After 10 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.
Choose one.
A) 30
B) 40
C) 50
D) 60
E) 70
30 workers working already   Let x be the total men required to finish the task in next 20 days   2 km done hence remaining is 8 km   30lso, work has to be completed in next 20 days (30 - 10 = 20)   We know that, proportion of men to distance is direct proportion   and, proportion of men to days is inverse proportion   Hence, X = (30 * 8 * 10) / (2 *20)   thus, X = 60   Thus, more men needed to finish the task = 60-30= 
<gadget id="calculator">60-30</gadget>
<output>30</output>
30   30nswer : 30
<result>A</result>
An engineer undertakes a project to build a road 10 km long in 30 days and employs 30 men for the purpose. After 10 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.