Question 469471
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Hi,
sold 57 pizzas
Let x and (57-x) represent the number of $14 and $12 sold respectively
Question states*** 
   $14x + $12(57-x) = $722
Solving for x
    2x = 38
      x = 19,number of $14 sold.  38 $12 pizzas sold  (57-19)
CHECKING our Answer***
  $14*19 + $12*38 = $722