Ученик прочитал 45% всей книги, после чего ему осталось прочитать еще 165 страниц. Сколько страниц в этой книге 

Do grammar task: have got, has got, haven’t got  or hasn’t got:

1.Our secretary ____ a car. She gets to the office by bus. 2.Every day our engineers work with many documents. Today I ____ two telegrams and two faxes on my desk. 3.One of our managers is always late for his English lessons. 4.He _____ a lot of problems in his office. 5.Mr. Petrov wants to know languages well but he _____ time. 6.«Where is my business plan?» – «I don’t know. I ____ it».7«______ a computer?» – «No, I have not». 8.«______ a big office?» – «Yes, my office is large». 9.Our director ________ much time. He is very busy. 10.I _______ many books at home. I don’t like reading.11.Our manager _______ many offers from different firms in his file.

Рассчитать объем кислорода нормального условия, который расходуется при полном сгорании 6.4г. серы. Сколько г. оксида серы (4) образуется при этом?