Question 208928
Let  x  =  additive  volume  in  liters
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.40*x + .80*10 = .60*(10+x)
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.4x +8 = 6 + .6x
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2=.2x
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10=x
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check
.4*10 +.8*10 = .6 *(10+10)=12,,,,ok
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