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" A at the rate of 38 miles in a day, and B at the rate of 42 miles a day. How far apart will they be at the end of the first day ? How far at the end of 15 days ! 9. "
Arithmetic: Being a Sequel to First Lessons in Arithmetic - Σελίδα 15
των Warren Colburn - 1824 - 267 σελίδες
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Graded Work in Arithmetic, Βιβλίο 9

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James Morford Taylor - 1904 - 171 σελίδες
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