Question

A can do a work in 20 days. B can do it in 15 days. C can do it in 12 days. If they work together, how much time would it take to complete the work.
a)5
b)6
c)8 2/3
d) 20 2/5

Please help me : )

Answer 1

Answer:

I don't really know but your answer could be 5 days. Yes.

Answer 2

Answer:

(a) 5

Step-by-step explanation:

Formula:

1/x = 1/A + 1/B + 1/C

Solution:

1/x = 1/20 + 1/15 + 1/12

1/x = 1/5

x = 5