Home » Aptitude » Time and Work

50 men can build a tank in 40days, but though they begin the work together, 5 men quit every ten days. The time needed to build the tank is ?

Correct Answer: 50 days

Explanation:

50 men can build a tank in 40 days 


Assume 1 man does 1 unit of work in 1 day


Then the total work is 50×40 = 2000 units


 


50 men work in the first 10 days and completes 50×10 = 500 units of work


45 men work in the next 10 days and completes 45×10 = 450 units of work


40 men work in the next 10 days and completes 40×10 = 400 units of work


35 men work in the next 10 days and completes 35×10 = 350 units of work


So far 500 + 450 + 400 + 350 = 1700 units of work is completed and


 


Remaining work is 2000 - 1700 = 300 units


 


30 men work in the next 10 days. In each day, they does 30 units of work.


 


Therefore, additional days required = 300/30 =10


 


Thus, total 10+10+10+10+10 = 50 days required.


← Previous Question Next Question→

More Questions from Time and Work

Discussion & Comments

No comments yet. Be the first to comment!
Join Discussion