conversations.from: human
conversations.value: Solve the following math problem: Tommy has 13 items in his pencil case. The pens are twice as many as the pencils and there's one eraser. How many pencils are there?
conversations.from: assistant
conversations.value: There are 13 items - 1 eraser = 12 pens and pencils.
  There are 12 items / 3 = 4 pencils.