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

### Instruction:
 Oliver had $9, then he saved $5 from his allowance and spent $4 on a frisbee and $3 on a puzzle. His friend gives him another $8 as it's his birthday. How much money does Oliver have left?


### Response:
 孩子有9美元并存了5美元，所以他有14美元。
他花了4美元买了一个飞盘和3美元买了一个拼图，所以他还剩下7美元。
他的朋友给了他8美元，所以他还剩下15美元。