IMO Mathematics Olympiad Class 9: Questions 582  586 of 919
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Question number: 582
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.  65 marks 

b.  29 marks 

c.  45 marks 

d.  61 marks 

Question number: 583
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.  26 

b.  31 

c.  28 

d.  25 

Question number: 584
» Linear Equations in Two Variables
Question
The solution of the equation and is________
Choices
Choice (4)  Response  

a.  x = 6, y = 1 

b.  x = 4, y = 1 

c.  x = 5, y = 2 

d.  x = 6, y = 2 

Question number: 585
» Analytical Reasoning and Logical Reasoning
Question
If the positions of the third and tenth letters of the word DOCUMENTATION are interchanged, and likewise the positions of the fourth and seventh letters, the second and sixth letters are also interchanged, then which of the following will be eleventh letter from the right end?
Choices
Choice (4)  Response  

a.  T 

b.  U 

c.  N 

d.  I 

Question number: 586
» Analytical Reasoning and Logical Reasoning
Question
Choose the correct mirror image of the figure (X)?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 
