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

### Instruction:
Linda is repainting her bedroom. The wall area is 600 sq. ft. If a gallon of paint can cover 400 sq. ft., how many gallon cans of paint will Linda have to buy if she wants to do two coats?

### Response:
 600 ตารางฟุต x 2 ชั้น = <<600*2=1200>>1200 ตารางฟุต
1200 ตารางฟุต / 400 ตารางฟุตต่อกระป๋อง = <<1200/400=3>>3 กระป๋องสี