A, B and C can do a work in 12, 15 and 20 days respectively. They started working together but after 4 days A left. In how many days will B and C complete the work?
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days taken by A to complete its work=12
days taken by B to complete its work=15
days taken by C to complete its work=20
total number of days in which A B and C can complete their work =12+15+20
number of days after which A left doing its work=4
number of days in which B and C will complete their work=(15+20)+(12-4)
=35+8
=43 days
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