IMO Level 1 Mathematics Olympiad (SOF) Class 9: Questions 613  619 of 929
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Question number: 613
Question
The mean of 13 observations is 14. If the mean of the first 7 observations is 12 and that of the last 7 observations is 16, then the 7^{th} observation is ________
Choices
Choice (4)  Response  

a.  14  
b.  18  
c.  12  
d.  16 
Question number: 614
» Analytical Reasoning and Logical Reasoning
Question
In the given question, which number can replace the question mark
Choices
Choice (4)  Response  

a.  1  
b.  7  
c.  36  
d.  9 
Question number: 615
Question
A man purchases an electric heater whose printed price is Rs. 160. If he received two successive discounts of and , he p
Choices
Choice (4)  Response  

a.  Rs. 112  
b.  Rs. 129.60  
c.  Rs. 119.60  
d.  Rs. 115.20 
Question number: 616
» Linear Equations in Two Variables
Question
If , then values of y are________
Choices
Choice (4)  Response  

a.  y = 20 and y = 30  
b.  y = 15 and y=10  
c.  y = 25 and y = 5  
d.  y=10 and y=30 
Question number: 617
Question
Algebraic sum of the deviation of a set of values of a data from their mean is ________
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 618
» Linear Equations in Two Variables
Question
Rakesh has dollars more than Mohan has, and together they have a total of dollars. Which of the following represented the number of dollars than Mohan has?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 619
» Introduction to Euclid's Geometry
Question
In the figure , and , if , what is the length of ?
Choices
Choice (4)  Response  

a.  1  
b.  4  
c.  2  
d.  3 