question: Four friends ordered four pizzas for a total of 64 dollars. If two of the pizzas cost 30 dollars, how much did each of the other two pizzas cost if they cost the same amount?
answer: The other two pizzas cost 64-30 = <<64-30=34>>34 dollars.
  Each of the other two pizzas cost 34/2 = <<34/2=17>>17 dollars each.
  #### 17