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Donna bought a candy bar for $1.50. She paid with nickels and dimes. She used 21 coins in all. How many nickels (n) and

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Donna bought a candy bar for $1.50. She paid with nickels and dimes. She used 21 coins in all. How many nickels (n) and how many dimes (d) did she use? n+d=21 .05n+.10d=1.50 [?] nickels dimes

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