Mọi người giải giúp mình bài này: Trong kì thi Olympic môn Toán khối 8, nếu sắp mỗi phòng thi 23 học sinh thì thừa 6 em, nếu giảm đi 1 phòng thi thì số học sinh được chia cho mỗi phòng. Tính số học sinh tham gia kì thi biết rằng 1 phòng thi không chứa quá 45 HS.

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Insert a suitable preposition where necessary. 1, He arrived……………..the manager’s office………………….an interview. 2, He devoted his whole life………………………….writing. 3, This village is famous…………………………..its beauty. 4, Mary insisted……………………..taking the bus instead……………………………the taxi. 5, Don’t use the office phone……………………………personal calls. 6, She often helps her mother………………………her work…………………..the house. 7, Don’t lean………………….that window. The paint is still wet. 8, The airplane crashed…………………………..the sea about one kilometre………….the eight floor. 9,…………………….the rush hour, the streets are jammed………………………………cars. 10, Sam spent his savings………………………….an expensive holiday. 11, The words……………….all the songs are printed…………………the back………………..the cover. 12, This is a very solid house. It’s built………………………..brick………………..a tiled floor. 13, Aren’t you sorry…………………………….what you have done? 14, He was angry …………………himself………………………….having made such a big mistake. 15, He threw stones………………………..his attackers. 16, As I am bad………….English, I have a lot…………difficulties when attending English Speaking Club. 17. We are grateful…………………………..you…………………………..your help. 18, Mr Davis will retire………………………….his job………………………two year’s time. 19, The cause…………………the fire…………….the hotel…………last night is still unknown. 20, She often complains………………………….everything. 21, When I realised that I had taken the wrong number, I immediately apologised………….my mistake. 22, She hasn’t got a job. She depends…………………her perents………………money. 23, She smiled…………………me as she passed me…………………….the street. 24, The accident was my fault, so I had to pay……………….the damage…………………the other car. 25, It wasn’t very polite………………………him to leave………………saying “ thank you “……….anyone. 26, He’s been doing the same job………………..too long. He’s bored…………………..it. 27, The number………………..people who suffered……………………heart disease has increased. 28, We discussed…………………….many things……………………the meeting. 29, I’ve always regarded you……………….one……………….my best friend. 30, I glanced………………the newspaper to see if there was anything interesting…………………it. 31, Travelling is great………………….first but you get tired…………….it…………………a while. 32, I explained…………him that it was the custom……….England to wash one’s car……….the weekend 33, The man we interviewd………………….the job was quite intelligent but we weren’t very impressed… ………………………his appearance. 34, He spent a lot of money………………..buying English books…………………………his studies. 35, I’m not very keen…………………………..Italian food. , Nothing ( do )………………………………since I moved here.