Question 651716
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Hi,
Correct Set Up is:
 0.5X + 50(0.12)= 0.4(X+50)   ||The <u>amount of 'solution'</u> on both sides must be the same
   {{{ .1X = .28*50}}}
         X = 140gal of 50% solution needed
and..
{{{.5*140 + .12*50 = 70 + 6 = 76 = .4*190}}}