A jeweler wants to make a silver alloy to be used to make necklaces. How many ounces of a silver alloy that costs $3.50 per ounce should be mixed with one that costs $7.00 per ounce to make a new 30-ounce alloy that costs $6.30 per ounce?

Answer 1

we've done a lot of these mixture problems for you. Why not try some yourself, and we can check your work...

Answer 2

Hmmm. I may have been hasty. Anyway, if there are x oz. of $3.50 alloy, the rest (30-x) is the $7.00 alloy. So, check to be sure that the value of silver adds up:

3.50x + 7.00(30-x) = 6.30(30)
x = 6