IMO Mathematics Olympiad Class 8: Questions 124  132 of 1029
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Question number: 124
Question
A number is multiplied by itself and then 15 is subtracted from the product. If the final result is 2545, then find the original number.
Choices
Choice (4)  Response  

a.  13  
b.  30  
c.  32  
d.  31 
Question number: 125
Question
The area of a square field is sq. m. The length of each side of the field is ________.
Choices
Choice (4)  Response  

a.  4.00  
b.  1.92  
c.  2.00  
d.  2.50 
Question number: 126
Question
The number must be subtracted from 13245 to get a perfect square is________.
Choices
Choice (4)  Response  

a.  11  
b.  20  
c.  15  
d.  10 
Question number: 127
Question
Find the smallest square number which is exactly divisible by 15, 25, and 30 is, ________
Choices
Choice (4)  Response  

a.  100  
b.  180  
c.  500  
d.  900 
Question number: 128
Question
The value of is________.
Choices
Choice (4)  Response  

a.  0  
b. 
 
c. 
 
d. 

Question number: 129
Question
If , then equals________.
Choices
Choice (4)  Response  

a.  3  
b.  1  
c.  4  
d.  2 
Question number: 130
Question
The value of is________.
Choices
Choice (4)  Response  

a.  2  
b. 
 
c. 
 
d.  Both b. and c. are correct 
Question number: 131
Question
The least two digit number, which is a perfect square is ________
Choices
Choice (4)  Response  

a.  4  
b.  16  
c.  12  
d.  9 
Question number: 132
Question
Find the smallest square number which is exactly divisible by 8, 12, 15, and 20 is, ________
Choices
Choice (4)  Response  

a.  3600  
b.  2500  
c.  900  
d.  180 