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

### Instruction:
Sam and Drew have a combined age of 54. Sam is half of Drew's age. How old is Sam?

### Response:
 ให้ x เป็นอายุของดรูว์
แซมอายุ (1/2) * x
x+(1/2) * x = 54
(3/2) * x = 54
3 * x = 108
x = <<36=36>>36
แซมอายุ 36/2 = <<36/2=18>>18 ปี