A can do a piece of work in 14 days while B can do it in 21 days. In how many days, working together they will complete the whole work?
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Step-by-step explanation:
work done by a in one day=1/14
work done by b in one day =1/21
work done by A and B together in one day =1/14+1/21
=(3+2)/21
=5/21
whole work done by A and B together =21/5 =4.2 days
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