algebra

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Tom's mother pays him $.50 for each problem his gets correct on his test, but he has to give her .25 for each problem he gets wrong. If Tom makes $8.00 on the test, and there were 25 total problems on the test, how many did he answer correctly?

Thanks!

  • algebra -

    NC is number corret.
    NC+NR=25

    .5*NC-.25NW=8
    .5*NC-.25(25-NC)=8
    .5*NC-6.25+.25*NC=8
    solve for NC

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