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" A man bought a quantity of flour for 53^ dollars, and sold it for f of what it cost him ; how much did he gain ? 3. If 7 men can do a piece of work in 4f days, how long will it take 1 man to do it ? How long will it take 3 men to do it ? 4. "
Arithmetic by Grades for Inductive Teaching, Drilling and Testing - Σελίδα 26
των John Tilden Prince - 1895
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