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2016-03-21T15:54:27+05:30

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labourers =9000 in 15 days
9000/- in a day=15*5
                     = 75
1/- in a day=5*15/9000
                  = 1/120
1/- in 8 days=1/120*8
 no.of labourers for 6720/- in 8 days=6720*1/120*8
                                                         = 672/96 
                                                         =7

7 labourers are required
2 5 2
hope it helps................^-^
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