Question

A and B can finish a piece of work in 5 days, A and C in 10 days and B and C in 15 days. How much work will they do together in 2 days?

Answer 1

Hope it helps you out......

Answer 2

A + B = 5 days for 1 piece of work

A + C = 10 days for 1 piece of work

B + C = 15 days for 1 piece of work

Add them up to finish the number of days needed for 3 pieces of work

3A + 3B + 3C = 30

Find 1 day of work:

3A + 3B + 3C = 30

Divide by 3 through

A + B + C = 10

Find the amount of work done in 2 days:

1 day = 1/10 of the work

2 days = 1/10 x 2 = 1/5 of the work

Answer: 1/5 of work is done in 2 days if all the 3 works together