SOLUTION: one solution is 15% ammonia. A second solution is 40% ammonia. How many ounces of each should be used to make 100 ounces of a 20% ammonia solution?

Question 433582: one solution is 15% ammonia. A second solution is 40% ammonia. How many ounces of each should be used to make 100 ounces of a 20% ammonia solution?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
percent ---------------- quantity
Ammonia I15----------------x ounces
Ammonia II40----------------100 -x ounces
Total 20.00% ----------------100

15x+40(100-x)=20*100
15x+4000-40x=2000
15x-40x=2000-4000
-25x= -2000
/-25
x=80 ounces 15.00%
Balance 20 ounces = 40% ammonia

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