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600 L of 12% acid has x L of 30% acid added to give a mixture between 15% and 18% acid. Find x.
A100 < x < 250
B120 < x < 360
C120 < x < 300
D150 < x < 300
Answer & Solution
Correct answer: C. 120 < x < 300
0.3x + 72 > 0.15(x + 600) gives x > 120, and 0.3x + 72 < 0.18(x + 600) gives x < 300.
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