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Sally has twice as many dimes as nickels. The total value is $3.50 how many nickels and dimes does she have?
d=2n .05n+.1d=3.5 I multiplied the nickels and dimes by these values because that is their actual monetary value .05n=3.5-.1d multiply everything by 20 n=70-2d d/2=70-2d .5d+2d=70 2.5d=70 d=28 n=14 so there are 28 dimes and 14 nickels checking this answer 28 dimes = $2.8 14 nickels = .70 2.8+.7=3.5
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