Playing With Numbers (IMO Mathematics Olympiad Class 6): Questions 81  86 of 86
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Question number: 81
» Playing With Numbers
Question
The HCF of two numbers is 28 and their LCM is 336. If one number is 112, then the other number is
Choices
Choice (4)  Response  

a.  34 

b.  92 

c.  84 

d.  64 

Question number: 82
» Playing With Numbers
Question
The least number of square tiles that will be needed to coat a plot of 126 m by 63 m is
Choices
Choice (4)  Response  

a.  4 tiles 

b.  2 tile 

c.  3 tiles 

d.  1 tiles 

Question number: 83
» Playing With Numbers
Question
Two tanks contain 360 liters and 900 liters of water respectively, then the maximum capacity of a container which can measure the water out of both the tanks when used an exact number of times is ________.
Choices
Choice (4)  Response  

a.  160 liters 

b.  170 liters 

c.  190 liters 

d.  180 liters 

Question number: 84
» Playing With Numbers
Appeared in Year: 2012
Question
A prime number can best be described as ________.
Choices
Choice (4)  Response  

a.  A number with more than 2 different factors 

b.  Always an even number 

c.  Always an odd number 

d.  A number with exactly 2 factors 

Question number: 85
» Playing With Numbers
Appeared in Year: 2012
Question
A number for which sum of all its factors is equal to ________ the number is called perfect number.
Choices
Choice (4)  Response  

a.  Twice 

b.  Square 

c.  Thrice 

d.  Four times 

Question number: 86
» Playing With Numbers
Appeared in Year: 2012
Question
Find the lowest natural number which when divided by 112, 140 and 168 leaves a remainder 8 in each case.
Choices
Choice (4)  Response  

a.  1440 

b.  720 

c.  1688 

d.  1672 
