Below is an instruction that describes a task. Write a response that appropriately completes the request in Thai. Please answer in Thai.

### Instruction:
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?

### Response:
 ให้ x เป็นราคาของเก้าอี้
โต๊ะมีราคา 3x
โซฟามีราคา 3x*5 = 15x
x+3x+15x = $380
19x=$380
x = $380/19 = $<<380/19=20>>20
ราคาของโซฟาคือ $15*20 = $<<15*20=300>>300