Question

A, B and C can complete a work in 5 days. If A and C can complete the same work in 7 1/2 days and A alone in 15 days, then in how many days can B and C finish the work?

Answer 1

Answer:

B and C can do work in 15/2

Step-by-step explanation:

please check the image

Answer 2

Answer:

B and C finish the work in 71/2 days.

Step-by-step explanation:

A+B+C complete the work in 5 days.

(A+B+C)'s 1 day work = 1/5

Best answer

(A + C) complete the work in 7 1/2 days = 15/2 days

(A+C)'s 1 day work = 1/15/22/15

B's 1 day work = (A+B+C)'s 1 day work - (A+ C)'s 1 day work.

1/5-2/15 3/15-2/15

C's 1 day work (A + C)'s 1 day work-A's 1 day work

=2/5-1/15 1/15

Now (A+C)'s 1 day work = B's 1 day work+ C's 1 day work

=1/15+1/15=2/15

(B+ C) can complete the work in 1/(2/15) days.

=15/2 days=71/2 days

B and C finish the work in 71/2 days.

#SPJ2