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 and think first.
300
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.

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The answer: 300