IMO Mathematics Olympiad Class 9: Questions 607  612 of 919
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Question number: 607
» Analytical Reasoning and Logical Reasoning
Question
If in the following groups of numbers after adding all the digits of each group, are arranged in decreasing order, then which will be middle group?
853, 395, 486, 249, 497, 766, 914
Choices
Choice (4)  Response  

a.  486  
b.  395  
c.  497  
d.  766 
Question number: 608
Question
A man rows downstream 40 50 km and upstream 20 30 km, taking 10 20 hours each time. The velocity of current is ________
Choices
Choice (4)  Response  

a.  3.5 km/hr  
b.  1.5 km/hr  
c.  2.5 km/hr  
d.  0.5 km/hr 
Question number: 609
Question
The mean weight of 60 students in a class is 40 kg. The mean weight of boys is 50 kg while that of the girls is 30 kg. the number of boys and girls are________
Choices
Choice (4)  Response  

a.  20, 40  
b.  30, 30  
c.  35, 25  
d.  25, 35 
Question number: 610
Question
A contractor employed 10 labourers at Rs. 60 each per day, 12 labourers at Rs. 40 each per day, 8 labourers at Rs. 20 each per day and 6 labourers at Rs. 10 each per day. The average wages paid is ________
Choices
Choice (4)  Response  

a.  Rs. 60  
b.  Rs. 36  
c.  Rs. 26  
d.  Rs. 40 
Question number: 611
Question
A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, find the n umber of blue balls in the bag.
Choices
Choice (4)  Response  

a.  15  
b.  10  
c.  5  
d.  20 
Question number: 612
Question
If , and then value of x, y, z when , is________.
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 
