Question

A can do a work in 10 days b in 16 days but with gbe help of c they can do in 4 days. in how many days alone can do the work

Answer 1

Given A can do whole work in 10 days

B can do it in 16 days

ABC together can do it in 4 days

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We need to find C's alone working days.

So, 1 day work of A = 1/10

1 day work of B = 1/16

1 day work of ABC = 1/4

1 day work of C = 1 day work of ABC - 1 day work of A and B

= 1/4 - 1/10 - 1/16

= (20 - 8 - 5) / 80

= 7/80

C's 1 day work = 7/80

C will do whole work alone in 80/7 = 11 3/7 days.

Answer 2

I think c alone can do the work in 12 days.I'm not sure about it