Answer:
John has 7 dimes and 13 nickels
Step-by-step explanation:
let N = nickels
let D = dimes
5N + 10D = 135
N = D + 6
5(D + 6) +10D = 135
5D + 30 + 10D = 135
15D = 135 - 30 = 105
D = 105 / 15 = 7
N = D + 6 = 7 + 6 = 13
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