12 men complete a work in 18 days. After starting the work 4 men joint. In how many days they complete the left work?
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See 1me can do=1/12×18 ok
=1/216ok
now 12×1/216×6=1/3
now 1/3+1/12×16=20/12 ok
now add 20/12+6=9days it will take
=1/216ok
now 12×1/216×6=1/3
now 1/3+1/12×16=20/12 ok
now add 20/12+6=9days it will take
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