A can do a piece of work in 20 days while B can do it in 15 days . With the help of C , they finish the work in 5 days . In what time would C alone do it?
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A's 1 day work = 1/20
B's 1 day work = 1/15
A, B and C's 1 day work = 1/5
C's 1 day work = 1/5 - 1/20 - 1/15=
1/5 - 35/300 = 25/300
C can finish the work alone = 300/25
= 12 days
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B's 1 day work = 1/15
A, B and C's 1 day work = 1/5
C's 1 day work = 1/5 - 1/20 - 1/15=
1/5 - 35/300 = 25/300
C can finish the work alone = 300/25
= 12 days
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