какие вещества образуются при разложении соли BaCO3 ?дайте им названия

. Поставьте следующие предложения в вопросительную и отрицательную форму.

2. Their office hours begin at 9 o’clock.  3. Mr.Bell is busy all day. 4. There are some cables on the table. 5. She can translate some letters from English into Russian. 6. He has some offers from Bell&Co. 7. Mr. Smith had bought several machines from Green&Co by June 2005. 8. They were reading French newspapers yesterday at 5 o’clock. 9. The engineers met some inspectors a week ago. 10. We have already received fives enquiries from Blake&Co. 11. They have a lot of offices in London.

Дядя Федор разделил 250 на задуманное число,вычел из частного 24 и результат умножил на 2.Получилось 52. Какое число задумал дядя Федор?