SOLUTION: Bea Kurr is hired by the local chemical plant to create mixtures for use in various labs at the chemical plant. On Bea's first day on the job she finds 20 liters of 12% boric acid

Question 307829: Bea Kurr is hired by the local chemical plant to create mixtures for use in various labs at the chemical plant. On Bea's first day on the job she finds 20 liters of 12% boric acid and only 32 liters of 20% boric acid. Bea's new boss wants exactly 30 liters of an 18% solution. How many liters of 12% solution should she use to get exactly 30 liters of 18% solutions?
A 5.5
B 7.5
C 10
D 15
E 22.5
PLS HELP ME IM SO CLUELESS, this is a very hard problem for me
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
(12%)(x) + (20%)(30 - x) = (18%)(30)

12x + 600 - 20x = 540

60 = 8x

7.5 = x
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