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

### Instruction:
To get ready for the new school year, Mary brought her two kids shopping. She bought her son James, a coat for $40 and two pairs of jeans. She bought his sister Jamie, a pair of shoes for $30. The total cost of the items was $110. If the two pairs of jeans for James cost the same price, how much did one pair of jeans cost?

### Response:
 จำนวนเงินที่ใช้สำหรับกางเกงยีนส์ทั้งสองคู่คือ 110 - 40 - 30 = 40 ดอลลาร์
กางเกงยีนส์หนึ่งคู่จะมีราคา 40 / 2 = 20 ดอลลาร์