1.

A can do a piece of work in 21 days and B in 28 days. Together they started the work and B left after 4 days. In how many days can A alone do the remaining work?

Answer»

14



Let A worked for X days.

 x/21 + 4/28 = 1 => x/21 = 6/7=> x = 18

A worked for 18 days. So, A can complete the remaining WORK in 18 - 4 = 14 days.



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