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" ... 11. There is a school, in which 2 ninths of the boys learn arithmetic, 3 ninths learn grammar, 1 ninth learn geography, 1 ninth learn geometry, and 12 learn to write ; how many are there in the school ? and how many attending to each study ? 12. "
Intellectual Arithmetic: Upon the Inductive Method of Instruction - Σελίδα 68
των Warren Colburn - 1849 - 160 σελίδες
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