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5n + 10d = 235, where n = number of nickels and d = number of dimes. we are also told that n + d = 30 Multiplying by 5 we get 5n + 5d =150 Subtract this from the first equation and we get 5d = 85, ie d = 17, so n = 13 Ie Yolanda has 13 nickels (65c) and 17 dimes ($1.70), total 30 coins worth $2.35.

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Q: Yolanda has 30 coins worth 2.35 She has only nickels and dimes How many dimes does Yolanda have?

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