If A and B can do a work in 30 days, B and C can do the same work in 24 days and C and A in 20 days. In how many days the work will be completed , if they all work together?

I got 16. What do you guys think??

Here's the working:

2*(A+B+C)= 1/30+1/24+1/20= 1/8 So, A+B+C s work in 1 hour can accomplish 1/16th of the project. To complete the entire project ( 16/16) , multiply 16 with 1 hour = 16 hours. No? I got marked wrong.

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TopNewest16 is the right answer.

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