Key to the progressive practical arithmetic, including analysis of the miscellaneous examples in the progressive intellectual arithmetic: for teachers only

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Ivison, Phinney, 1861 - Mathematics - 190 pages
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Page 157 - Tilings to be considered in any progression ; viz., the first term, the last term, the common difference or the ratio, the number of terms, and the sum of the series, any three of which being given the other two can be found, as will appear from the subsequent discussion.
Page 152 - J and are equal to • and f, and the proportional quantities are 2 bushels of timothy seed to 3 bushels of clover seed. 2. What proportions of teas worth respectively 3, 4, 7 and 10 shillings a pound, must be taken to form a mixture worth 6 shillings a pound ? OPERATION.

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