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Hillary has eleven coins, all dimes and nickels. In total, the coins are worth 75 cents. How many nickels does she have?

 Oct 2, 2020
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0.05N  +  0.10 * [11 - N] =0.75, solve for N

 

N = 7 nickels

11 - 7 = 4 dimes

[7 x 0.05]  +  [4 x 0.10] =0.75 or 75 cents.

 Oct 2, 2020

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