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Math Help - Word Problems

  1. #1
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    Word Problems

    An actor invests some money at 7%, and 47,000 more than four times the amount at 12% The total annual interest earned from the investment is 49640. How much did he invest in each amount?
    He invested ___ at 7% and ___ at 12%

    A pharmacist wishes to mix a solution that is 7% minoxdil. She has on hand 80ml of a 1% solution and wishes to add some 9% solution to obtain the desired 7% solution. how much 9% solution should she add?

    how many gallons of 50% anti-freeze solution must be mixed with 100 gallons of 30% anti-freeze to get a mixture that is 40% anti-freeze?
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  2. #2
    MHF Contributor
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    1. The total interest earned will be .07x + .12(47000 + 4x) = 49640. Simplify and solve for x.

    2. Write an equation for the total amount of minoxdil. .01(80) + .09(x) = .07(80 + x).

    3. Write an equation for the total amount of antifreeze. .3(100) + .5x = .4(100 + x).
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