You can put this solution on YOUR website! Hi,
Let n be the number of nickels. then (40-n) will be the number of dimes.
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question states**
10(40-n) + 5n = 290
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simplify and solve
400-10n + 5n = 290
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-5n = -110
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n = 22 the number of nickels
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check your answer
10*18 + 5*22 = 290