. If 30 labourers working 7 hours a day can finish a piece of work in 18 days, how many labourers working 6 hours a day can finish it in 30 days?
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Answer:
M1*D1*T1 = M2*D2*T2
30*7*18 = X*6*30
X = 7*18/6 = 21 (Ans.)
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