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

### Instruction:
Tonya is buying Christmas gifts for her sisters. She has 2 sisters and wants to spend the exact same amount on each. She buys her younger sister 4 dolls that cost $15 each. She plans to buy lego sets for her older sister. They cost $20 each. How many lego sets does she buy?

### Response:
 เธอใช้เงิน $60 ให้กับพี่สาวน้อยของเธอเพราะ 4 x 15 = <<4*15=60>>60
เธอซื้อเซตเลโก้ 3 เซตให้กับพี่สาวของเธอเพราะ 60 / 20 = <<60/20=3>>3