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A can complete 9/10 part of a work in 31 days. After that, with the help of B he can complete the remaining work in 4 days. In how many days will A and B together can complete that work ?

Correct Answer: 40

Explanation:

Remaining work = 1 - 9/10 = 1/10


 


=> A & B together completes 1/10 of work in 4 days


 


=> 1 work can completed in ------ ? days


 


Let it be x days


 


=>   4 1 10 = x 1


 


=> x = 40 days.


 


Hence, A & B together can complete the work in 40 days.


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