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Two persons, A and B, have the same income: A saves |- of his yearly ; but B, by spending \$150 per annum more than A, at the end of 8 years, finds himself \$400 in*debt ; what is their income, and what does each spend per annum '? A.
Practical and Mental Arithmetic: On a New Plan, in which Mental Arithmetic ... - Σελίδα 255
των Roswell Chamberlain Smith - 1830
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