A can do a piece of work in 10 days, B and C can do it in 15 days and A and C can do it in 20 days. How long will they take to do it together and individually?
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1/10+1/15+1/20
= LCM of 10 15 20
60
6/60+4/60+3/60
13/60ans
or
10+20+15
=45
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