 
<translate> Akwai 30 x 2 = 60 masu halarta daga kamfanin B. Kamfanin C yana da 30 + 10 = 40 masu halarta. Kamfanin D yana da 40 - 5 = 35 masu halartar rajista. Saboda haka, jimillar waɗanda suka halarci taron daga kamfanonin A, B, C, da D su ne 30 + 60 + 40 + 35 = 165. Saboda haka akwai 185 - 165 = 20 masu halarta waɗanda ba daga kamfanonin A, B, C, ko D ba. Amsar ƙarshe: 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. 