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

### Instruction:
 Asilimia arobaini ya wanafunzi wamechagua kujifunza nyumbani wakati wa janga la corona. Wanafunzi waliobaki wamegawanywa katika makundi mawili sawa, ambapo kundi moja tu lipo shuleni kila siku. Asilimia ngapi ya wanafunzi wapo shuleni?


### Response:
 100% - 40% = 60% ya wanafunzi wamebaki.
60% / 2 = 30% ya wanafunzi wapo shuleni.