SOLUTION: How many ounces of pure zinc must be alloyed with 20 ounces of brass that is 30% zinc and 70% copper to produce brass that is 40% zinc?

Question 826417: How many ounces of pure zinc must be alloyed with 20 ounces of brass that is 30% zinc and 70% copper to produce brass that is 40% zinc?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
One material quantity known, one material quantity unknown.
L = 30%
T = 40%, target value
H = 100%
U = 20 ounces
v = unknown, pure zinc, ounces

(Total zinc)/(total mixture amount)=(target concentration)

, solve for v.

'
Now you substitute the values to compute v.
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