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How many liters each of a 15% acid solution and a 35% acid solution must be used to produce 70 liters of a 25% acid solution?

 Mar 5, 2020
 #1
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Let  x be the  liters  of the  15%  solution

So......70 - x  =  the liters of  the  35%  solution

 

We have this :

 

.15x  + .35 (70  - x)    =  .25(70)     simplify

 

.15x  + 24.5  - .35x  =   12.5

 

-.20x +  24.5  =  12.5     subtract  24.5 from both sides

 

-.20x  =  -12      divide both sides by  .20

 

x =  60  liters of the 15%  solution

 

70 - 60  =   10 liters of the  35% solution

 

 

 

cool cool cool

 Mar 5, 2020

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