 
<translate> Lizzy: Wani kamfani yana shirya taron karawa juna sani. Ya zuwa yanzu, an yi rajistar masu halarta 30 daga kamfanin A; Kamfanin B yana da ninki biyu na masu halarta na kamfanin A; Kamfanin C yana da masu halarta 10 fiye da kamfanin A; Kamfanin D yana da masu halarta 5 ƙasa da kamfanin C. Idan jimillar masu halarta 185 sun yi rajista, da yawa daga cikin masu halarta waɗanda suka yi rajista ba daga kowane kamfani A, B, C ko D ba? Ni: Hmmm, bari in yi tunani. Ina ganin wannan shi ne cikakken bayani: <eng> Lizzy: A company is hosting a seminar. So far, 30 attendees from company A have been registered; company B has twice the number of attendees of company A; company C has 10 more attendees than company A; company D has 5 fewer attendees than company C. If a total of 185 attendees have registered, how many attendees who registered are not from either company A, B, C or D?.
Me: Hmmm, let me think. I think this is the detailed solution: 