A can do a work in 15 days and B in 20 days. If they work on it togeth – McqOptions

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1.	A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is ?
A.	1 /10
B.	1/ 4
C.	8 /15
D.	7 /15
Answer» D. 7 /15

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