math

posted by .

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 :)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. algebra

    assume that a jeweler needs 80 grams of an alloy that is 30% gold. He has avaliable one alloy that is 5% gold and another that is 85% gold; he will mix some of each If x equal the number of grams of the first alloy (so the number of …
  2. Physics

    The karat is a dimensionless unit that is used to indicate the proportion of gold in a gold-containing alloy. An alloy that is one karat gold contains a weight of pure gold that is one part in twenty-four. What is the volume of gold …
  3. Algebra

    The purity of gold is measured in karats. Twenty-four karat gold is pure gold and k karat gold is k/24 gold by mass. One piece of 16-karat gold jewelry has a mass of 30 grams and another piece of 10-karat gold jewelry has a mass of …
  4. chemistry

    From the jewelry descriptions given, select the homogeneous mixture or solution. Answer?
  5. Chemistry

    From the jewelry descriptions given, select the homogeneous mixture or solution. Answer?
  6. Algebra

    A goldsmith has two gold alloys. The first alloy is 20% gold; the second alloy is 60% gold. How many grams of each should be mixed to produce 40 grams of an alloy that is 30% gold?
  7. Chemistry

    The relative amount of gold in an alloy is commonly expressed in units of carats. Pure gold is 24 carats, and the percentage of gold in an alloy is given as a percentage of this value. For example, an alloy that is 50 percent gold …
  8. algebra

    A goldsmith has two gold alloys. The first alloy is 30% gold; the second alloy is 80% gold. How many grams of each should be mixed to produce 10 grams of an alloy that is 40% gold?
  9. chemistry

    A 14 karat gold alloy contains 58% m/m gold. How much of this alloy can a jeweler make using 50.0 g of pure gold?
  10. College Algebra

    A goldsmith has two gold alloys. The first alloy is 30% gold; the second alloy is 80% gold. How many grams of each should be mixed to produce 50 grams of an alloy that is 68% gold?

More Similar Questions