conversations.from: human
conversations.value: I would love to understand how to solve this problem: Roy has 2 blue pens. He has twice as many black and 2 less than twice as many red than black pens. How many pens does Roy have in all?
  Can you explain?
conversations.from: assistant
conversations.value: Roy has 2 x 2 = 4 black pens.
  Twice the number of black pens is 4 x 2 = 8.
  So, there are 8 - 2 = 6 red pens.
  Therefore, Roy has 2 + 6 + 4 = 12 pens in all.