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

### Instruction:
 Utafiti uliofanywa na shule ulionyesha kuwa ni asilimia 20 tu ya wazazi 800 wanaunga mkono ongezeko la ada. Wazazi wangapi hawakubaliani na ongezeko la ada?


### Response:
 Kulikuwa na wazazi 800 x 20/100 = <<800*20/100=160>>160 ambao walikubaliana na ongezeko la ada.
Hivyo, kulikuwa na wazazi 800 - 160 = <<800-160=640>>640 ambao hawakukubaliana.