IMO Level 1 Mathematics Olympiad (SOF) Class 9: Questions 607  612 of 929
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Question number: 607
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.  35,25 

b.  20,40 

c.  25,35 

d.  30,30 

Question number: 608
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. 26 

b.  Rs. 60 

c.  Rs. 40 

d.  Rs. 36 

Question number: 609
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.  5 

c.  10 

d.  20 

Question number: 610
Question
If , and then value of x, y, z when , is________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 611
Question
Two coins are tossed simultaneously. The probability of getting at least one head is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  0 

Question number: 612
» Analytical Reasoning and Logical Reasoning
Question
In a telephone directory which of the following names will appear in the third position
Choices
Choice (4)  Response  

a.  Mahinder 

b.  Mahender 

c.  Mahendra 

d.  Mahindra 
