計(jì)算題
  
Solve the puzzle to find out how many ping-pong balls are flying about here. The top ball is your answer.   Answer: ____                                                                

2. What is twice a half of five and a half?    
A. Ten and a half.              
B. Five and a half.    
C. Ten.                      
D. Two and a half.    
Answer: _____                                                                
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