# In How many days A, B and C can Complete Work Together

A and B can do a work in 12 days, B and C in 15 days, C and A in 20 days. If A, B and C work together will complete the work in (days)

- 5
- 68/6
- 10
- 47/3

**Answer: (a) 5 days.
Explanation:-
**A and B can do a work = 12 days

A and B can do a work in a day = 1/12 day

B and C can do same work = 15 days

B and C can do same work in a day = 1/15

B and C can do same work = 20 days

B and C can do same work = 1/20

Therefore, A, B and C work together will complete the work in a day = (1/12 + 1/15 + 1/20)/2

= 12/60 = 1/5

Hence, A, B and C work together will complete the work in 5 days.