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Anna has 15 coins in her purse. All are nickels and dimes. They total 1.35?
Wiki User
∙ 14y ago
D + N = 15, so D = 15 - N; 10D + 5N = 135.
Substitute: 10(15 - N) + 5N = 135 ie 150 - 10N + 5N = 135 ie 5N = 15
So she has 3 nickels and 12 dimes (3 x 5) + (12 x 10) = 15 + 120 = 135 QED
Wiki User
∙ 14y ago
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