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题目列表(包括答案和解析)

计算题
1. What percentage of area is shaded?

Answer: _                                                          .
2. If a group of 6 people have an average age of 21,  and each person is half the age of the next person,
    what are the ages of the 6 people?
Answer: _                                                           .

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计算题
1.
Answer:                                                                                
2. Bill is eighteen years old, and his age is three times that of Mary.  
When Billis twice as old as Mary, how old is he then?
Answer:                                                                        

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计算题。
1. Kate has a quzuler more books than Peter and Peter has a third more books than Jill.
Altogether they have 120. How many books does each person have?
Answer: __________________________________________________________
2. What weight must be placed at "?" to balance the Scale?

Answer:____________________________________________________________

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计算题
  
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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计算题.
1.At 12 noon my watch was correct. However, it then started to lose 18 minutes per hour.
Four hours ago it stopped completely and is now showing the time as 15:30.
What is the correct time now?
Answer: _____________________________________________________________
2.
What value of weight should be placed on the scales to balance?
Answer: _____________________________________________________________

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