Answer:
7 nickels
Explanation:
let x = number of nickels
If she has six more dimes than nickels, we can make an expression
x + 6
1 dime = 10 cents
1 nickel = 5 cents
10x + 5(x+6) = 135
10x + 5x + 30 = 135
15x = 135 - 30
15x = 105
x = 7
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