A can do a work in 25 days which B alone can do in 20 days A started the work and was joined by B af...........

Quantitative Aptitude ( CCS) Time and work

A can do a work in 25 days which B alone can do in 20 days. A started the work and was joined by B after 10 days . Find the number of days taken in completing the work ?

7(1/3)days

16(2/3) days

12(1/3)days

5(1/7)days

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Explanation:

Solution:
Total work = 100 units
A = 4 units/ work
A do for 10 days of work = 40
remaining = 60
A+ B = 9
remaining work completed in= 60/9 = 6(2/3)
B = 5 units/work
Total days in completing the work = 10 + 6(2/3) = 16(2/3) days