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? Let's be accurate as possible.
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.
The answer: 300.