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" Two persons, A and B, can perform a piece of work in 16 days. They work together for four days, when A being called off, B is left to finish it, which he does in 36 days. In what time would each do it separately? "
Key to Dodd's Algebra: Containing All the Problems, and the More Difficult ... - Σελίδα 146
των James William Dodd - 1859
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