阅读短文，根据短文内容选择正确答案。
   My name is Peter．I am 12．I have one brother and one sister．My brother is 15 and my sister is 9．I have a friend．He is an English boy．His name is Tanaka．He is in my class．I have a dog, too．Its name is Billy．Billy is 2．I like sports．I play basketball, soccer and volleyball after class（放学后）．I have one pencil case, two English books and three Chinese books．

How much money does the man have before anyone lends him money?

55+4＝____

55+40＝____

77-2＝____

77+20＝____

55-4＝____

55-40＝____

77+2＝____

77-20=____