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

### Instruction:
On Thursday Walmart sold 210 pounds of ground beef. On Friday they sold twice that amount. On Saturday they only sold 150 pounds.  What was the average amount of beef sold per day?

### Response:
 ปริมาณเนื้อวัวทั้งหมดที่ขายไปคือ 210 + 420 + 150 = 780 ปอนด์
ปริมาณเนื้อวัวเฉลี่ยที่ขายต่อวันคือ 780 / 3 = 260 ปอนด์