IMO Level 1 Mathematics Olympiad (SOF) Class 6: Questions 144  152 of 1059
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Question number: 144
Question
There are 378 Mangoes in a basket. A girl takes out 7 Mango from it and replaces them by 15 orange. She continues to do so, till all Mangoes are replaced by Orange. Find the number of orange put in the basket?
Choices
Choice (4)  Response  

a.  480 

b.  850 

c.  460 

d.  810 

Question number: 145
Question
Which of the following is not a perfect cube?
Choices
Choice (4)  Response  

a.  216 

b.  512 

c.  342 

d.  27 

Question number: 146
Question
The numbers which are multiplies of 2 are called________.
Choices
Choice (4)  Response  

a.  Odd 

b.  Composite 

c.  Prime 

d.  Even 

Question number: 147
Question
The smallest value of ‘x’ in the number 156 × 0 so that it is divisible by10 is:
Choices
Choice (4)  Response  

a.  2 

b.  1 

c.  0 

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

Question number: 148
Question
is divisible by
Choices
Choice (4)  Response  

a.  7 

b.  9 

c.  11 

d.  3 

Question number: 149
Question
The least number which when increased by 6 is exactly divisible by 12,24 and 48 is
Choices
Choice (4)  Response  

a.  23 

b.  54 

c.  36 

d.  42 

Question number: 150
Question
The reciprocal of the smallest prime is
Choices
Choice (4)  Response  

a.  0 

b.  2 

c.  1 

d. 


Question number: 151
Question
Which of the following is a perfect square?
Choices
Choice (4)  Response  

a.  49 

b.  68 

c.  56 

d.  48 

Question number: 152
Question
Which of the following is the pair of twin primes?
Choices
Choice (4)  Response  

a.  (5,11) 

b.  (7,11) 

c.  (17,19) 

d.  (19,23) 
