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

### Instruction:
 Kati ya wanafunzi 80 waliofanya mtihani wa biolojia, ni wanafunzi 2/5 tu waliweza kupata alama 100%. Ikiwa alama chini ya 80% inahesabiwa kama kufeli, na asilimia 50 ya wanafunzi waliobaki ambao hawakupata alama 100% waliweza kupata alama zaidi ya 80%, hesabu idadi ya wanafunzi waliofeli mtihani.


### Response:
 Ikiwa wanafunzi 2/5 waliofanya mtihani wa biolojia walipata alama 100%, basi wanafunzi 3/5 hawakupata alama 100%. Idadi ya wanafunzi ambao hawakupata alama 100% ni 3/5*80 = <<3/5*80=48>>48
Kati ya wanafunzi 48 ambao hawakupata alama 100%, 50/100*48 = <<50/100*48=24>>24 wanafunzi walipata alama chini ya 80%.