SOLUTION: A 100% concentrate is to be mixed with a mixture having a concentration of 35% to obtain 55 gallons of a mixture with a concentration of 80%. How much of the 100% concentrate will

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Question 1022578: A 100% concentrate is to be mixed with a mixture having a concentration of 35% to obtain 55 gallons of a mixture with a concentration of 80%. How much of the 100% concentrate will be needed? (Round your answer to one decimal place.)
Answer by josgarithmetic(39625) About Me  (Show Source):
You can put this solution on YOUR website!
v, how much of the pure material;
55-v, how much of the 35% material;

%2835%2855-v%29%2B100v%29%2F55=80---------if you understand this, then you are all set to solve it and finish.