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Two hundred liters of a 75% acid solution is obtained by mixing a 90% solution with a 50% solution. How many liters of each?

 Jan 14, 2020
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200 liters of 75% = .75 (200) = 150 gallons of acid

 

.90 x   +  .50(200-x)  = 150

.9x   + 100 - .5x = 150

.4x = 50

x = 90% solution = 125 gallons

 

200-x = 50% solution = 200-125 = 75 gallons of 50% solution

 
 Jan 14, 2020

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