conversations.from: human
conversations.value: Solve the math problem: John's cow weighs 400 pounds.  It increased its weight to 1.5 times its starting weight.  He is able to sell the cow for $3 per pound.  How much more is it worth after gaining the weight?
conversations.from: assistant
conversations.value: The cow initially weighs 400*1.5=600 pounds
  So it gained 600 - 400 = 200 pounds
  So its value increased by 200*$3 = $600