Question

A and B can do a piece of work in 12 days. B and C can do it in 15 days. A and C can do it in 20 days . how many days will A take to finish the same work ?​

Answer 1

Answer:

A,B and C can together finish 1/10th of the work in 1 day. ∴ A alone can do it in 30 days.

Step-by-step explanation:

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Answer 2

Answer:

Given A and B do piace of work in 12 days and B and C in 15 days and C and A in 20 days

Then A and B one day work =

12

1

AND B and C one day work =

15

1

And C and A one day work =

20

1

Then A ,B and c two days work =

12

1

+

15

1

+

20

1

=

60

5+4+3

=

60

12

=

5

1

Then A ,B and c one days work=

5

1

×

2

1

=

10

1

So A,B and C do work in 10 days