SOLUTION: Bess has $2.80 in quarters and dimes. The number of dimes is 7 less than the number of quarters. Find the number she has of each kind

Question 814375: Bess has $2.80 in quarters and dimes. The number of dimes is 7 less than the number of quarters. Find the number she has of each kind
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
25k + 10d = 280
d = k - 7
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25k + 10d = 280
25k + 10(k - 7) = 280
25k + 10k - 70 = 280
35k = 350
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k = 10
d = 3
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