Question 396673
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Hi
Let x and (30-x) represent the amount of the $5 and $3.50/lb candies respectively
Question states***
Mixing to form 30lbs of $4.50/lb
 5x + 3.50(30-x) = 4.50*30
          1.5x = 1*30lb
             x = 1*30lb/1.5
             x = 20lb, the amount of the chocolate hearts
                 10lb of the candy kisses

CHECKING our Answer
  5*20 + 10*3.50 = 100 + 35 = 4.50*30 =