A can do a piece of work in 9 days While B can do it in 6 days. with the help of c they finish the work in 3 days. then c alone can do the work in
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A complete work = 9 days
B complete work = 6 days
A,B,C complete work = 3 days
C complete's work = work by A +work by B/ work done by A,B,C
=( 9 +6 / 3 )days
=15/ 3
= 5 days
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