Question 336525
80*.8=64 total liters alcohol in 80% soln.
x *.1=.1x total liters alcohol in 10% soln.
(80+x)*.5=40+.5x total liters alcohol in 50% soln.
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64+.1x=40+.5x
24=.4x
x=60 L of the 10% alcohol must be added.
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Ed