math

alexander had some nickles in his bank. he added 3 dimes to the bank and then he had 85 cents.how many nickles did he have left? write an equation and work backward to solve.

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  1. .05(x)+ .10(3)=.85
    .05x+ .3=.85
    -.3 -.3
    .05x=.55
    /.05 /.05
    x=11

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