Number Systems (IMO Mathematics Olympiad Class 6): Questions 51  55 of 84
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Question number: 51
» Number Systems
Question
Rohan’s monthly salary is Rs. 18000. He spends Rs. 2050 for his home expenses, Rs. 1590 for purchasing clothes, Rs. 870 for purchasing groceries, milk, etc. , Rs. 1900 for purchasing medicine and pays a rent of Rs. 4500 in a particular month. How much does he save in this month?
Choices
Choice (4)  Response  

a.  Rs. 7090 

b.  Rs. 8609 

c.  Rs. 7050 

d.  Rs. 6870 

Question number: 52
» Number Systems
Question
Product of two integer is If one of the integers is , then the other is
Choices
Choice (4)  Response  

a.  19 

b.  1 

c.  0 

d.  9 

Question number: 53
» Number Systems
Question
The expression is equivalent to, uses the ________ property.
Choices
Choice (4)  Response  

a.  Associative 

b.  Closure 

c.  Identity 

d.  Commutative 

Question number: 54
» Number Systems
Question
Multiply the unit’s place of the number obtained by reversing the digits of the number 78923 with the hundred’s place of the number obtained by interchanging the digits in the unit’s place and the thousand’s place of the same number, we get________.
Choices
Choice (4)  Response  

a.  54 

b.  64 

c.  16 

d.  63 

Question number: 55
» Number Systems
Question
Subtract the number obtained by reversing the digits of the number 20198 from the number obtained by interchanging the digits in the unit’s place and the hundred’s place of the same number, we get________.
Choices
Choice (4)  Response  

a.  77121 

b.   68229 

c.  68004 

d.   68211 
