SOLUTION: How many ounces of a metal other than gold must be added to 56 ounces of pure gold to make a composition 70% gold?

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Question 208984: How many ounces of a metal other than gold must be added to 56 ounces of pure gold to make a composition 70% gold?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
How many ounces of a metal other than gold must be added to 56 ounces of pure
gold to make a composition 70% gold?
:
Let x = amt of metal to be added
:
Write an "amt of gold" equation
56 = .7(x+56)
56 = .7x + 39.2
56 - 39.2 = .7x
16.8 = .7x
x = 16.8%2F.7
x = 24 oz of metal
;
:
Check solution
.7(24+56) = 56