conversations.from: human
conversations.value: This math problem has got me stumped: John injures his shoulder while lifting weights.  After the injury, his bench press goes down 80%.  After a bit of training, he manages to triple the weight he can bench.  If he started with a 500-pound bench press, what is it now?
  Can you show me the way?
conversations.from: assistant
conversations.value: He lost 500*.8=400 pounds from his bench
  So his bench went to 500-400=100 pounds
  After training it increased to 100*3=300 pounds