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

### Instruction:
 汉娜正在做香蕉面包。她每杯香蕉泥需要用3杯面粉。每杯香蕉泥需要4个香蕉。如果汉娜用了20个香蕉，她应该用多少杯面粉？


### Response:
 汉娜会得到20个香蕉 / 4个香蕉/杯 = <<20/4=5>>5杯香蕉泥。
汉娜应该用3杯面粉 * 5杯香蕉泥 = <<3*5=15>>15杯面粉。