IMO Mathematics Olympiad Class 9: Questions 549  553 of 919
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Question number: 549
Question
The value of k for which is a factor of is ________.
Choices
Choice (4)  Response  

a.  7 

b. 


c. 


d. 


Question number: 550
Question
P and Q can do a piece of work in 15 days and Q alone can do it in 30 days. The time taken by P alone to do the work is ________
Choices
Choice (4)  Response  

a.  35 days 

b.  12 days 

c.  40 days 

d.  30 days 

Question number: 551
» Analytical Reasoning and Logical Reasoning
Question
Bhavesh started from his house towards North. After covering a distance of 8 km. he turned towards left and covered a distance of 6 km. what is the shortest distance now from his house?
Choices
Choice (4)  Response  

a.  15 km 

b.  10 km 

c.  16 km 

d.  2 km 

Question number: 552
Question
The average of 15 numbers is calculated as 20. It is discovered later on that while calculating the average one number, namely 41 was wrongly read as 31. The correct average is________
Choices
Choice (4)  Response  

a.  20.6 

b.  19.5 

c.  13.5 

d.  16.5 

Question number: 553
Question
In Arun’s opinion, his weight is greater than 65 kg but less than 72 kg. His brother does not agree with Arun and he thinks that Arun’s weight is greater than 60 kg but less than 70 kg. His mother’s view is that his weight cannot be greater than 68 kg. If all of them are correct in their estimations, what is the average of different probable weights of Arun?
Choices
Choice (4)  Response  

a.  68 kg 

b.  67 kg 

c.  69 kg 

d.  Question does not provide sufficient data or is vague 
