A can do work in 15 days and B in 20 days. Both together worked for 5 days and then A left the work. How long will B take to complete the remaining work??
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A's one day of work= 1/15
B's one day of work= 1/20
then work done by them together in one day = 1/15 + 1/20= 35/300
hence they together complete the work in 300/35 days
Now 5 days of their work with each other = 5x(1/15 + 1/20) = 1/3 + 1/4 = 7/12 days
B's one day of work= 1/20
then work done by them together in one day = 1/15 + 1/20= 35/300
hence they together complete the work in 300/35 days
Now 5 days of their work with each other = 5x(1/15 + 1/20) = 1/3 + 1/4 = 7/12 days
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