1. If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work ?
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By: anil on 05 May 2019 02.01 am
B does complete work in 20 days
hence in unit time amount of work done will be $$frac{1}{20}$$
suppose in unit time amount of work done by A will be $$x$$
hence when they are working together amount of work done in unit time will be
$$x$$ + $$frac{1}{20}$$ = $$frac{1}{15}$$ (given)
$$x$$= $$frac{1}{60}$$
it means A does $$frac{1}{60}$$ amount of work in unit time
now unit work will be done ,when A alone is working, in 60 days
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hence in unit time amount of work done will be $$frac{1}{20}$$
suppose in unit time amount of work done by A will be $$x$$
hence when they are working together amount of work done in unit time will be
$$x$$ + $$frac{1}{20}$$ = $$frac{1}{15}$$ (given)
$$x$$= $$frac{1}{60}$$
it means A does $$frac{1}{60}$$ amount of work in unit time
now unit work will be done ,when A alone is working, in 60 days