A can do a piece of work alone in 8 days. B can do the same work alone in 21 days. If they work together for 3 days, then how much work is completed?

A can do a piece of work alone in 8 days. B can do the same work alone

1.	A can do a piece of work alone in 8 days. B can do the same work alone in 21 days. If they work together for 3 days, then how much work is completed?
A.	\(\frac{{27}}{{64}}\)
B.	\(\frac{{26}}{{67}}\)
C.	\(\frac{{29}}{{56}}\)
D.	\(\frac{{31}}{{65}}\)
Answer» D. \(\frac{{31}}{{65}}\)

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A can do a piece of work alone in 8 days. B can do the same work alone in 21 days. If they work together for 3 days, then how much work is completed?

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