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

### Instruction:
 瓦尔将一个西瓜切成40片，每片有20颗黑籽和20颗白籽。一个西瓜有多少颗籽？


### Response:
 首先计算每个西瓜的黑籽总数：40片 * 每片20颗黑籽 = <<40*20=800>>800颗黑籽
然后计算每个西瓜的白籽总数：40片 * 每片20颗白籽 = <<40*20=800>>800颗白籽
然后将黑籽数和白籽数相加，得到每个西瓜的总籽数：800颗籽 + 800颗籽 = <<800+800=1600>>1600颗籽