IMO Mathematics Olympiad (SOF) Class 9: Questions 845  850 of 919
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Question number: 845
Question
The mean of 24 observations is 35. If the mean of the first 12 observations is 31 and that of the last 12 observations is 38, then the 12^{th} observation is ________
Choices
Choice (4)  Response  

a.  14 

b.  15 

c.  11 

d.  12 

Question number: 846
» Analytical Reasoning and Logical Reasoning
Question
Choose the correct alternative that will continue the same pattern. 6,11,21,36,56, (…. . )
Choices
Choice (4)  Response  

a.  51 

b.  81 

c.  91 

d.  42 

Question number: 847
» Linear Equations in Two Variables
Question
Which equation satisfies the data in the table?
X  3  5  7  9 
Y  2  4  6  8 
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 848
Question
Factors of
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 849
Question
In a mathematics test given to 15 students, the following marks (out of 100) is recorded: 45,56,78,54,75,34,68,98,87,99,90,76,55,77,68, then mean, median and mode of this data are respectively ________
Choices
Choice (4)  Response  

a.  60.67,75,65 

b.  70.67,77,68 

c.  70.67,75,68 

d.  55.26,78,65 

Question number: 850
Question
A man purchased two clocks A and B at a total cost Rs. 650. He sells A at profit and B at a loss of and gets the same selling price for both the clocks. What are the purchasing prices of A and B respectively?
Choices
Choice (4)  Response  

a.  Rs. 250, Rs. 400 

b.  Rs. 225, Rs. 425 

c.  Rs. 300, Rs. 350 

d.  Rs. 275, Rs. 375 
