56/(56+x) = 70/100
silver/(silver + additive)
silver / total weight
is 70% or 70/100
56/(56+x) = .7
Cross multiply and solve for x
How many ounces of other metal must be added to 56 ounces of pure silver to make a composition that is 70% silver?
Please help me set this problem up
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Thank you!
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