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

### Instruction:
 玛丽正在做菠菜蛋饼。她拿了40盎司的生菠菜，烹饪后它的体积变为初始体积的20%。如果她将菠菜与6盎司奶油奶酪和4盎司鸡蛋混合在一起，蛋饼的总体积是多少？


### Response:
 首先烹饪菠菜：40盎司 * 20% = <<40*20*.01=8>>8盎司
然后混合所有的配料：8盎司菠菜 + 6盎司奶油奶酪 + 4盎司鸡蛋 = <<8+6+4=18>>18盎司