Peter spent 150 dollars on book each month. How much did he spend on book in half a year?

Peter spent 150 dollars on book each month. How much did he spend on book in half a year? 
 Answer:  ... ? dollars.

Mr Junior bought 1 magazine, 1 book and 1 pen. The pen costs 5 dollar, the book costs 31 dollar more than the pen. The magazine costs twice as much as the book. How much did he spend on the three things?

Mr Junior bought 1 magazine, 1 book and 1 pen. The pen costs 5 dollar, the book costs 31 dollar more than the pen. The magazine costs twice as much as the book. How much did he spend on the three things?

giup minh nhe
 

Mr Junior bought 1 magazine, 1 book and 1 pen. The pen costs 5 dollar, the book costs 31 dollar more than the pen. The magazine costs twice as much as the book. How much did he spend on the three things?

                                    Reported speech

1."I have a sister.Her name is Hoa"

->He said

2."Don't step on this floor"

->He asked us

3."How much meat did she buy"

->He asked

4."Is this your book"

->He asked her

5."Is this book yours"

->He asked me

Giúp mình với!Mình đang cần gấp

A book store had a box of books. One half but 5 fewer books were sold on the first day. One third of the remaining part and 12 more books were sold on the second day. Finally 20 books are left. How many book(s) did the book store have originally?

Giúp mình với : 

A book store had a box of books. One half but 5 fewer books were sold on the first day. One third of the remaining part and 12 more books were sold on the second day. Finally 20 books are left. How many book(s) did the book store have originally?