question: Cody and Trevor had 12 sandwiches. Cody ate a third of the sandwiches, and Trevor ate a quarter of the sandwiches. How many sandwiches are left?
answer: Cody ate 12/3=<<12/3=4>>4 sandwiches.
  Trevor ate 12/4=<<12/4=3>>3 sandwiches.
  Cody and Trevor ate 4+3=<<4+3=7>>7 sandwiches.
  There are 12-7=<<12-7=5>>5 sandwiches left
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