Number System (IMO Mathematics Olympiad Class 7): Questions 15  19 of 81
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Question number: 15
» Number System
Question
In a magic square each row, column and diagonal have the same sum, then the values of A and B are respectively________.
6

1

4

A

3

5

2

7

B

Choices
Choice (4)  Response  

a. 
 
b.  0, 0  
c.  1, 1  
d. 

Question number: 16
» Number System
Question
If p: When a positive integer and a negative integer are added we always get a positive integer.
q: When two positive integers are added, we get a positive integer, then
Choices
Choice (4)  Response  

a.  P and q are false  
b.  P is true and q is false  
c.  P and q are true  
d.  P is false and q is true 
Question number: 17
» Number System
Question
Which of the following number is not prime?
Choices
Choice (4)  Response  

a.  4  
b.  3  
c.  2  
d.  5 
Question number: 18
» Number System
Question
A tank contains 1000 liters of water. Due to a small hole in the tank, the quantity of water is decreasing at the rate of 10 liters every hour. What will be the quantity of the water in the tank after 20 hours?
Choices
Choice (4)  Response  

a.  210 liters  
b.  900 liters  
c.  800 liters  
d.  490 liters 
Question number: 19
» Number System
Question
If P: When two negative integers are added we always get a negative integer.
q: When two positive integers are added, we get a positive integer, then
Choices
Choice (4)  Response  

a.  P is false and q is true  
b.  P and q are false  
c.  P and q are true  
d.  P is true and q is false 