Playing With Numbers (IMO Mathematics Olympiad (SOF) Class 6): Questions 65  72 of 86
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Question number: 65
» Playing With Numbers
Question
The least number which when decreased by 7 is exactly divisible by 6, 7, 21 and 42 is
Choices
Choice (4)  Response  

a.  53 

b.  49 

c.  35 

d.  36 

Question number: 66
» Playing With Numbers
Question
HCF of the two numbers =
Choices
Choice (4)  Response  

a.  Product of numbers × their LCM 

b.  Product of numbers  their LCM 

c.  Product of numbers + their LCM 

d.  Product of numbers ÷ their LCM 

Question number: 67
» Playing With Numbers
Question
Which of the following is the pair that is not twin primes?
Choices
Choice (4)  Response  

a.  (5, 7) 

b.  (11, 13) 

c.  (17, 19) 

d.  (23, 29) 

Question number: 68
» Playing With Numbers
Question
The least number of square tiles that will be needed to pave a plot 225 m by 30 m is
Choices
Choice (4)  Response  

a.  45 tiles 

b.  15 tiles 

c.  30 tiles 

d.  25 tile 

Question number: 69
» Playing With Numbers
Question
The number (67, 54) are
Choices
Choice (4)  Response  

a.  prime and coprime 

b.  Prime numbers 

c.  Coprime numbers 

d.  Question does not provide sufficient data or is vague 

Question number: 70
» Playing With Numbers
Question
The number 11284 and 7655 when divided by a certain 3 digit number leave the same remainder. Find the number and the remainder
Choices
Choice (4)  Response  

a.  190, 14 

b.  180, 20 

c.  191, 15 

d.  195, 25 

Question number: 71
» Playing With Numbers
Question
The number (9, 8) are
Choices
Choice (4)  Response  

a.  Coprime numbers 

b.  Prime numbers 

c.  Prime and coprime 

d.  All of the above 

Question number: 72
» Playing With Numbers
Question
The least number of square tiles that will be needed to pave a plot 135 m by 15 m is
Choices
Choice (4)  Response  

a.  12 tiles 

b.  18 tiles 

c.  9 tiles 

d.  15 tiles 
