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

### Instruction:
 Sherehe ya harusi ya kifungo cha ndoa ilikuwa na watu 180. Bibi harusi na bwana harusi kila mmoja aliwaalika wanandoa 20 kutoka upande wao wa familia. Wageni wengine walikuwa marafiki. Marafiki wangapi walihudhuria sherehe?


### Response:
 Kutoka upande wa bibi harusi, wanandoa 20 * wageni 2/wanandoa = <<20*2=40>>40 wageni walihudhuria
Kutoka upande wa bwana harusi, wanandoa 20 * wageni 2/wanandoa = <<20*2=40>>40 wageni walihudhuria
Hivyo kulikuwa na wageni 180 - (wageni 40 + wageni 40) = 100 marafiki waliohudhuria sherehe