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" Ib. at the same rate ? 7. A locomotive goes 3 miles in 4 minutes. How far does it go in an hour? 8. 4 horses can eat a certain quantity of hay in 10 months. How long will it last 20 horses? 9. 12 men can do a piece of work in 15 days. How long will 36... "
Intellectual Arithmetic: Or, An Analysis of the Science of Numbers, with ... - Σελίδα 107
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