SOLUTION: Coffee worth P90/kilo is mixed with a coffee worth P75/kilo to produce 300 kilograms of a mixture worth P80/kilo. How many kilos of each type should be used?

Question 1144979: Coffee worth P90/kilo is mixed with a coffee worth P75/kilo to produce 300 kilograms of a mixture worth P80/kilo. How many kilos of each type should be used?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Same problem, different numbers.
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Joan has a solution that is 18% acid and a second solution that is 43% acid. How many liters of each should she mixed together to get an 80L solution that is 26.5% acid?
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e = amount of 18%
f = amount of 43%
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e + f = 80 ----- total solution
18e + 43f = 80*26.5 ---- total acid
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Can you do the rest?
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