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 

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