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math

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shanon needs 20g of 80% of gold to make a pendan. she has some 85% gold and some 70% gold, from broken jewelry and wants to know how much she should use. determine the quantity of each alloy that she should use.

  • math -

    amount of 85% gold ---> x g
    amount of 70% gold ---> 20-x

    solve for x :
    .85x + .7(20-x) = .8(20)

  • math -

    thanks :)

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