conversations.from: human
conversations.value: I'm completely lost with this math problem: John climbs 3 staircases.  The first staircase has 20 steps.  The next has twice as many steps as the first.  The final staircase has 10 fewer steps than the second one.  Each step is 0.5 feet.  How many feet did he climb?
  Can you give me a hand?
conversations.from: assistant
conversations.value: The second flight had 20*2=40 steps
  The third had 40-10=30 steps
  So in total, he climbed 20+40+30=90 steps
  So he climbed 90*.5=45 feet