A can do a work in 21 days and B in 42 days. If they work on it together for 7 days, then what fraction of work is left?

A can do a work in 21 days and B in 42 days. If they work on it togeth

1.	A can do a work in 21 days and B in 42 days. If they work on it together for 7 days, then what fraction of work is left?
A.	44256
B.	44287
C.	44257
D.	44228
Answer» E.

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A can do a work in 21 days and B in 42 days. If they work on it together for 7 days, then what fraction of work is left?

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