math

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What type of math is this?
25% of what is 30?
and
solve for a: ab=b=3a-d

  • math -

    Your first problem is a percentage problem. 25% = 0.25
    0.25 * 30 = 7.5

  • math -

    your doing "is over of equals percnt over 100. so you set it up

    30/x =25/100
    cross multiply and solve for x

    25x= 3000

    dicide by 25 for your answer.

    this is stuff you learn in algebra. i am confused with the second equation though

  • math -

    But the answer is 120. I have the answers to those questions. I just need to know topics they are included in so I can study.

  • math -

    correction
    ab+b=3a-d

  • math -

    Oops, Alex, I misread your problem. I'm sorry.

    25% of what is 30
    0.25x = 30
    x = 30/0.25
    x = 120

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