Let a citron cost x and a wood-apple y. Adding 9x + 7y = 107 and 7x + 9y = 101 gives x + y = 13. Subtracting gives x − y = 3. Adding both yields x = 8 ...
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Let a citron cost x and a wood-apple y. Adding 9x + 7y = 107 and 7x + 9y = 101 gives x + y = 13. Subtracting gives x − y = 3. Adding both yields x = 8 ...