IMO Level 1 Mathematics Olympiad (SOF) Class 9: Questions 576  581 of 929
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Question number: 576
Question
If and , then value of is________.
Choices
Choice (4)  Response  

a.  1890  
b.  1895  
c.  1880  
d.  1885 
Question number: 577
Question
A man purchases an blander whose printed price is Rs. 2200. If he received two successive discounts of and , he paid________
Choices
Choice (4)  Response  

a.  Rs. 1221  
b.  Rs. 1232  
c.  Rs. 1121  
d.  Rs. 1132 
Question number: 578
» Linear Equations in Two Variables
Question
If , then values of x are________
Choices
Choice (4)  Response  

a.  x = 1 and x = 5  
b.  x = 5 and x=1  
c.  x = 2 and x = 3  
d.  x=1 and x=3 
Question number: 579
» Analytical Reasoning and Logical Reasoning
Question
Group the given figures into three classes using each figure only once.
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 580
Question
In a class test, in English, 25 students scored 70 marks, 40 students scored 65 marks and 35 scored 50 marks. The mean of their score is (approximately) ________
Choices
Choice (4)  Response  

a.  45 marks  
b.  29 marks  
c.  61 marks  
d.  65 marks 
Question number: 581
Question
The average of 20 numbers is calculated as 30. It is discovered later on that while calculating the average one number, namely 40 was wrongly read as 20. The correct average is________
Choices
Choice (4)  Response  

a.  25  
b.  28  
c.  31  
d.  26 