conversations.from: human
conversations.value: Find a solution for this math problem: John buys a chair. He then buys a table that is 3 times the price of the chair. Then, he buys a couch that is 5 times the price of the table. If John paid $380 for all these items, what is the price of the couch?
conversations.from: assistant
conversations.value: Let x be the price of the chair.
  The table costs 3*x.
  The couch costs 3*x*5=15*x.
  x+3*x+15*x=380
  19*x=380
  x=20
  The couch costs 20*15=300 dollars.