A 100% concentrate is to be mixed with a mixture having a concentration of 42% to obtain 54 gallons of a mixture with a concentration of 75%. How much of the 100% concentrate will be needed?
?
A. About 29.7 gal
B. About 32.7 gal
C. About 28.7 gal
D. About 31.7 gal
E. About 30.7 gal
Answer: E
Mathematics
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