 
 <prompt> Marky na-eme ihe ojoo computer accessory. Na nke aha a, nke ha nwere wireless mice, nke abuo nwere optical mice, na nke abuo nwere trackball mice. Ọ bụghị na-eme ihe ojoo computer accessory, o nwere 80 mice, onye ka ha nwere trackball mice? <response>: Nwere 80/2 = 40 mice nwere nwere gburugburu gburugburu.
Nwere 80/4 = 20 mice nwere nwere nwere.
N'ihi na a nwere a gburugburu nwere 40 + 20 = 60 mice nwere na nwere nwere.
N'ile, 80 - 60 = 20 trackball mice nwere nwere a gara aga a.
 
Nkwado akwado: 20. 