Question 218863
Let  x  =  amount  added  in  gallons
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.2*1 + .68*x = .24(1+x)
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.2 +.68x =.24 +.24x
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.44x = .04
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x=.091  gallons
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check,,,.2 +.68*.091 =1.091*.24
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             .2618       = .2618,,,,ok
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