Question 987424
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x=gallons of 9% solution needed.
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0.09x+0.11(35gal)=0.10(35gal+x)
0.09x+3.85gal=3.5gal+0.10x
0.35gal=0.01x
35gal=x
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ANSWER: 35 gallons of 9% solution should be used.
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CHECK:
0.09x+0.11(35gal)=0.10(35gal+x)
0.09(35gal)+0.11(35gal)=0.10(35gal+35gal)
3.15gal+3.65gal=0.10(70gal)
7.0gal=7.0gal