IMO Mathematics Olympiad Class 6: Questions 219  225 of 1049
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Question number: 219
Question
Number of prime and coprime numbers from 30 to 90 are
Choices
Choice (4)  Response  

a.  14 

b.  13 

c.  15 

d.  19 

Question number: 220
Question
Two tankers contain 850 liters and 680 liters of kerosene oil respectively, then the maximum capacity of a container which can measure the kerosene out of both the tankers when used an exact number of times is ________.
Choices
Choice (4)  Response  

a.  85 liters 

b.  10 liters 

c.  170 liters 

d.  34 liters 

Question number: 221
Question
The two numbers smaller than 4000 which are exactly divisible by each of 2, 3, 4, 5, 6 and 8 is
Choices
Choice (4)  Response  

a.  4020, 3810 

b.  3920, 4140 

c.  3720, 2880 

d.  2720, 4320 

Question number: 222
Question
If a, b and c are whole numbers such that b > a and c 0 and c > 3, then
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  None of the above 

Question number: 223
Question
The two numbers nearest to 10000 which are exactly divisible by each of 2, 3, 4, 5, 6 and 7 is
Choices
Choice (4)  Response  

a.  9669, 10080 

b.  10340, 10080 

c.  9320, 10080 

d.  9660, 10080 

Question number: 224
Question
The two consecutive prime numbers with difference 2 are called ________.
Choices
Choice (4)  Response  

a.  Composite 

b.  Coprimes 

c.  Twin primes 

d.  Even 

Question number: 225
Question
If are two whole numbers, then commutative law is applicable to multiplication if
Choices
Choice (4)  Response  

a. 
AND


b. 


c. 


d.  All a. , b. and c. are correct 
