 
<translate> E nwere 30 x 2 = ndị bịara 60 site na ụlọ ọrụ B. Ụlọ ọrụ C nwere 30 + 10 = ndị bịara 40. Ụlọ ọrụ D nwere 40 - 5 = 35 ndị bịaranụ. Ya mere, ngụkọta nke ndị si ụlọ ọrụ A, B, C, na D bịa bụ 30 + 60 + 40 + 35 = 165. N'ihi ya, e nwere mmadụ 185 - 165 = mmadụ 20 na-esoghị n'ụlọ ọrụ A, B, C, ma ọ bụ D. Azịza ikpeazụ: 20. <eng> There are 30 x 2 = 60 attendees from company B. Company C has 30 + 10 = 40 attendees. Company D has 40 - 5 = 35 registered attendees. So, the total attendees from company A, B, C, and D is 30 + 60 + 40 + 35 = 165. Therefore there are 185 - 165 = 20 attendees that are not from companies A, B, C, or D. Final answer: 20. 