A and B can do a piece of work in 12 days. B and C can do in 15 days. C and A in 20 days. How long would A takes separately to do the same work.
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(A+B+C)=(12+15+20)/2
=23.5
A+B+C=23.5
A=23.5-- 15
=8.5
=23.5
A+B+C=23.5
A=23.5-- 15
=8.5
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