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

### Instruction:
One pair of pants requires 8.5 feet of fabric. Nguyen needs to make 7 pairs of pants for the wedding. He has 3.5 yards of fabric. How many feet of fabric does Nguyen still need for the pants?

### Response:
 กางเกง = 8.5 ฟุต * 7 = <<8.5*7=59.5>>59.5 ฟุต
3.5 หลา = 10.5 ฟุต
59.5 - 10.5 = <<59.5-10.5=49>>49
งาวินต้องใช้ผ้าเพิ่มอีก 49 ฟุตสำหรับกางเกง