Mathematics, 27.09.2019 11:30 hijdjdjdbdjidjdbdbd

Three pipes a, b, and c can fill the tank in 10 hours, 20 hours and 40 hours respectively. in the beginning all of them are opened simultaneously. after 2 hours, tap c is closed and a and b are kept running. after the 4th hour, tap b is also closed. the remaining work is done by tap a alone. what is the percentage of the work done by tap a alone?

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Three pipes a, b, and c can fill the tank in 10 hours, 20 hours and 40 hours respectively. in the be...