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

### Instruction:
There were 40 kids on Lake Pleasant. A fourth of the kids went tubing, but only half of the tubers went rafting. How many of the kids who joined the rafting excursion were also on the tubing excursion?

### Response:
 40/4 = <<40/4=10>>10 เด็กไปเล่นทูบิ้ง
10/2 = <<10/2=5>>5 เด็กไปเล่นทูบิ้งและแรฟติ้ง