a. 200 tickets marked -1 and 180 marked +1

  
 b. 20 tickets marked -10 and 18 marked +10 
J 

  
 c. 1 ticket marked +10 and 1 marked -10 
J 

  
 d. 10 tickets marked +1 and 10 marked -1 
J 

  
 e. 180 tickets marked -1 and 200 marked +1 
J