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

### Instruction:
 一个冰淇淋摊贩的车上有50个巧克力味的冰淇淋和54个芒果味的冰淇淋。如果他卖掉了巧克力味冰淇淋的3/5和芒果味冰淇淋的2/3，有多少个冰淇淋没有卖出？


### Response:
 冰淇淋摊贩的车上有50个巧克力味冰淇淋和54个芒果味冰淇淋。
他卖掉了3/5的巧克力味冰淇淋，即50 x 3/5 = <<50*3/5=30>>30个。
他还卖掉了2/3的芒果味冰淇淋，即54 x 2/3 = <<54*2/3=36>>36个。
因此，未卖出的冰淇淋 = 50 - 30 = <<50-30=20>>20 + 54 - 36 = <<54-36=18>>18 = <<20+18=38>>38个。