Question

A can do a piece of work in 10 days and B in 20 days . They begin together but A leaves two days before the completion of the work. In how many days will the project be completed​

Answer 1

Answer:

6 days

Step-by-step explanation:

Work done by B in 20 days = 1

Work done by B in 1 day = 1/20

Work done by A in 10 days = 1

WORK done by A in 1 day = 1/10

Work done by both A and B in a day = 1/20 + 1/10 = 3/20

3/20 th part of work is done by them in 1 day

1 part is done in 20/3 days

Both work for 20/3 - 2 = 14/3 days

Part of work done in these days 14/3 * 3/20 = 7/10

Part left = 3/10

B does 1 part in 20 days

B does 3/10 part in 6 days

Therefore work will be completed in more 6 days

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