Working alone A can do a work in 72 days and B in 90 days. If they work on it together for 10 days, then what fraction of work is left?
3 / 4
Combined one-day work of A and B:
\[\frac{1}{72}+\frac{1}{90}=\frac{5+4}{360}=\frac{9}{360}=\frac{1}{40}\]
Work done in 10 days \(=\tfrac{10}{40}=\tfrac{1}{4}\). Fraction left \(=1-\tfrac{1}{4}=\) 3/4.
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