conversations.from: human
conversations.value: There are 8 red pens in Maria's desk drawer. There are 10 more black pens than red pens. There are also 7 more blue pens than red pens. How many pens are there in all?
  Give me a clear explanation.
conversations.from: assistant
conversations.value: Maria has 8 + 10 = 18 black pens.
  Maria has 8 + 7 = 15 blue pens.
  Maria has 8 + 18 + 15 = 41 pens in total.