Mathematics, 12.03.2021 21:50, alliemmaddox

P is able to do a piece of work in 15 days and Q can do the same work in 20 days. If they can work together for 4 days, what is the fraction of work left?

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P is able to do a piece of work in 15 days and Q can do the same work in 20 days. If they can work t...