SOLUTION: How many liters of antifreeze should be added to 5L of water too produce a solution that is no less than 60% antifreeze and no more than 80% antifreeze?

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Question 908923: How many liters of antifreeze should be added to 5L of water too produce a solution that is no less than 60% antifreeze and no more than 80% antifreeze?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Let T = any target value as percent antifreeze. Note that 0%3C=T%3C100.

v = volume of 100% antifreeze to add, measured in liters
T will be a constant, but used separately as two values.

highlight_green%28%28100%2Av%29%2F%28v%2B5%29=T%29;
Solve this for v. You will then use two different values of T to evaluate the minimum and maximum specified amounts v to add.

100v=T%28v%2B5%29
100v=Tv%2B5T
100v-Tv=5T
v%28100-T%29=5T
highlight%28v=%285T%29%2F%28100-T%29%29
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Evaluate v for T=60 and for T=80.