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d = n + 4; 10d + 5n = 160 so 10 (n +4) + 5n = 160 ie 10n + 40 + 5n + 160 ie 15n = 120 ie n = 8, so d= 12 Check: 12 dimes = $1.20, 8 nickels = 40c, total $1.60

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