Solve the problem.How much pure acid should be mixed with 7 gallons of a 50% acid solution in order to get an 80% acid solution?
A. 10.5 gal
B. 17.5 gal
C. 28 gal
D. 3.5 gal
Answer: A
Mathematics
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C. 2
D. 244
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A. 
B. 
C. 
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