Question 398200
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Hi
Let x and (300-x)represent the amounts of 65% and 20% solutions respectively
Question states***
Mixing together to form 300ml of 45% solution
  .65x + .20(300-x) = .45*300ml
solving for x
          .45x = .25*300ml
             x = .25*300ml/.45
             x = 166.6667ml of 65% solution