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

### Instruction:
 Kuna wazombie 480 katika jengo la maduka. Ikiwa idadi ya wazombie iliongezeka mara mbili kila siku, siku ngapi zilizopita kulikuwa na chini ya wazombie 50 katika jengo la maduka?


### Response:
 Kwanza tafuta idadi ya wazombie iliyokuwepo siku moja iliyopita: 480 wazombie / 2 = <<480/2=240>>240 wazombie
Kisha tafuta idadi ya wazombie iliyokuwepo siku mbili zilizopita: 240 wazombie / 2 = <<240/2=120>>120 wazombie
Kisha tafuta idadi ya wazombie iliyokuwepo siku tatu zilizopita: 120 wazombie / 2 = <<120/2=60>>60 wazombie
Kisha tafuta idadi ya wazombie iliyokuwepo siku nne zilizopita: 60 wazombie / 2 = <<60/2=30>>30 wazombie, ambayo ni chini ya 50, hivyo kulikuwa na chini ya wazombie 50 siku nne zilizopita.