IMO Mathematics Olympiad Class 9: Questions 608  613 of 919
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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. 


Question number: 613
Question
Two coins are tossed simultaneously. The probability of getting at least one head is ________
Choices
Choice (4)  Response  

a. 


b. 


c.  0 

d. 

