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" How many days will it take him if he works 12 hours a day ? 2. 6 men can build a wall in just 2 weeks. How many days will it take them if 2 men are added to their number ? 3. If 20 men can make a road in 180 days, how many days would it take 60 men ?... "
The Elements of Arithmetic ... in which Decimal and Integral Arithmetic are ... - Σελίδα 107
των Pliny Earle Chase - 1844
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