Hi,

Mary wants to make 10 qt. of a 63% saline solution 

by mixing together a 75% SALINE SOLUTION AND A 55% saline solution.

Let x and (10qt-x) represent the amount of 75% and 55% solutions respectively

     | After multiplying thru by 100

       20x = 80

         x = 4qt of 75% and 6qt of 55%   (10-4)

CHECKING our answer***

  

Answer by richwmiller(17219)   (Show Source): You can put this solution on YOUR website!
 .63*10=.75x+.55y,

x+y=10

x=4.,   y=6. 

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