algebra

divanna scored 67% on her test. IF she had paid closer attention to signs, she would have had 2 more problems right and would have scored 80%. write the expression for how many problems in all she would have answered correctly

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asked by blakers
  1. x/N=.8
    (x-2)/N=.66666

    x=.8N
    x-2=.6666N

    .8N-2=.6666N
    .13333N=2
    N=15

    so there were fifteen questions on the test, and .8N=12

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    posted by bobpursley

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