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If 17 labourers can dig a ditch 20 m ...

If 17 labourers can dig a ditch 20 m long in 18 days working 8 hours a day; how many more labourers should be engaged to dig a similar ditch 39 m long in 6 day, each labourer working 9 hours a day? `34` b. `51` c. `68` d. `85`

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