Question

A and B can do a piece of work in 20 days and B in 15 days they worked together for two days and then a goes away in how many days will be finish the work​

Answer 1

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Answer 2

$\huge\bf{Solution}$

Given that :-

A can do a piece of work = 20days

A can do a piece of work in 1 days = 1/20

Then,

B can do a piece of work = 15days

B can do a 1 piece of work in 1 days = 1/15

Then According to Questions:-

work done by A + work done by B = total work

$\frac{1}{20} + \frac{1}{15} \\ \\ \frac{3 + 5}{60} \\ \\ \frac{8}{60} \\ \\ \frac{1}{7.5} \\ \\ 7.5 days$

So both complete the work in 7.5 days.