In How Many day A, B and C can Together can Complete it? if

A and B together can complete a piece of work in 12 days, B and C can do it in 20 days and C and A can do it in 15 days. A, B and C together can complete it in

  1. 6 days
  2. 9 days
  3. 10 days
  4. 10.5 days
Desire Adnan Default Asked on 4th August 2015 in Maths.
Add Comment
1 Answer(s)

Answer: (3) 10 days
Explanation:-
A  and B can together complete the work = 12 days
A and B can do together work in a day = 1/12

B and C can complete the work  = 20 days
B and C can do the work in a day = 1/20

C and A can complete the work = 15
C and A can do the work = 1/15

A, B  and C can do together work in a day = (1/12 + 1/20 + 1/15) /2
=  ( 5 + 3 + 4)/60 x 2
=  12/60 x 2
= 1/2 x 5
1/10
Then, A B & C can do  complete the work = 10 days.
Hence, the answer is (3) 10 days.

Anurag Mishra Professor Answered on 4th August 2015.
Add Comment

Your Answer

By posting your answer, you agree to the privacy policy and terms of service.