 
<translate> Buru ụzọ chọpụta ole zombies e nwere otu ụbọchị gara aga: 480 zombies / 2 = 240 zombies. Mgbe ahụ chọpụta ole zombies e nwere ụbọchị abụọ gara aga: 240 zombies / 2 = 120 zombies. Mgbe ahụ chọpụta ọnụọgụgụ zombies ndị nọ ebe ahụ ụbọchị atọ gara aga: 120 zombies / 2 = 60 zombies. Mgbe ahụ chọpụta ọnụọgụ nke zombies e nwere ụbọchị anọ gara aga: 60 zombies / 2 = 30 zombies, nke na-erughị 50, yabụ enwere ihe na-erughị zombies 50 ụbọchị anọ gara aga. Azịza ikpeazụ ya bụ: 4. <eng> First find how many zombies there were one day ago: 480 zombies / 2 = 240 zombies. Then find how many zombies there were two days ago: 240 zombies / 2 = 120 zombies. Then find the number of zombies there were three days ago: 120 zombies / 2 = 60 zombies. Then find the number of zombies there were four days ago: 60 zombies / 2 = 30 zombies, which is less than 50, so there were less than 50 zombies 4 days ago. The final answer: 4. 