IMO Mathematics Olympiad Class 9: Questions 626  630 of 919
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Question number: 626
Question
The probability of guessing the correct answer to a certain test question is . If the probability of not guessing the correct answer to this question is , then x = ________
Choices
Choice (4)  Response  

a. 
 
b.  2  
c.  3  
d. 

Question number: 627
Question
Ten people are planning to share equally the cost of a rental bike. If one person withdraws from the arrangement and the others share equally the entire rental of the bike, then the share of each of the remaining persons is increased by ________ of the original share.
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d.  7 
Question number: 628
Question
The average of 12 students is 15. The marks of a student who scored zero were wrongly taken as 18 and average was determined. The correct average marks is________
Choices
Choice (4)  Response  

a.  15  
b.  12  
c.  14.5  
d.  13.5 
Question number: 629
Question
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 630
Question
The average weight of the students of a class is 30 kg. 3 new students with the average weight of 36 kg. Having joined the class, the average weight of the class is increased by 3 kg. Find the number of students in the class originally?
Choices
Choice (4)  Response  

a.  3  
b.  4  
c.  5  
d.  6 