Number Systems (IMO Mathematics Olympiad (SOF) Class 6): Questions 54  58 of 84
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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 

Question number: 56
» Number Systems
Question
Find the sum of the given expression.
Choices
Choice (4)  Response  

a.  55 

b.   100 

c.   90 

d.  100 

Question number: 57
» Number Systems
Question
Multiplying a negative integer for even number of times gives a ________ result.
Choices
Choice (4)  Response  

a.  0 

b.  Negative 

c.  Positive 

d.  None of the above 

Question number: 58
» Number Systems
Question
Sigma’s monthly salary is Rs. 22000. She spends Rs. 2000 for her beauty treatments, Rs. 1500 for purchasing clothes, Rs. 1250 for purchasing groceries and kitchen expenses, etc. , Rs. 3500 for jewelries and pays a rent of Rs. 5000 in a particular month. She also earns other Rs. 5000 by tuitions. How much does she save in this month?
Choices
Choice (4)  Response  

a.  Rs. 13750 

b.  Rs. 15750 

c.  Rs. 12945 

d.  Rs. 13550 
