Math

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I don't get the first problem of my homework. We learned three lessons today, the increase, decrease, and finding the base number. But i don't know which one I should use. Please help with this problem: There are 12 girls in Mr. Cooper's class. The girls make up 40% of the class. How many students are in the class?

  • Math -

    girls = 0.4 * total
    so
    12 = 0.4 * total
    so
    total = 12 / 0.4

    total = 30

    check:

    0.4 * 30 = 12 yes

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