IMO Mathematics Olympiad (SOF) Class 9: Questions 623  628 of 918
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Question number: 623
Question
Give the equations of two lines passing through. How many more such lines are there?
Choices
Choice (4)  Response  

a.  Exactly three 

b.  Infinitely many 

c.  Only one 

d.  Exactly Two 

Question number: 624
Question
The following observations have been arranged in the ascending order. If the median of the data 13,26,32,37, x + 2, x + 4,62,68,74,85 is 43, then the value of x is ________
Choices
Choice (4)  Response  

a.  44 

b.  42 

c.  40 

d.  46 

Question number: 625
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: 626
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: 627
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: 628
Question
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

