IMO Mathematics Olympiad (SOF) Class 9: Questions 665  671 of 919
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Question number: 665
Question
If 100 men can do a job in 80 days, in how many days will 120 men do it in ________.
Choices
Choice (4)  Response  

a.  69 days 

b.  67 days 

c.  65 days 

d.  63 days 

Question number: 666
» Introduction to Euclid's Geometry
Question
In the figure 3x = 90˚, then ∠ROS is________
Choices
Choice (4)  Response  

a.  140˚ 

b.  130˚ 

c.  150˚ 

d.  120˚ 

Question number: 667
Question
The compound interest on Rs. 80000 at per annum for 9 months, compound quarterly is ________
Choices
Choice (4)  Response  

a.  Rs. 15610 

b.  Rs. 12610 

c.  Rs. 14610 

d.  Rs. 13610 

Question number: 668
Question
If, then =
Choices
Choice (4)  Response  

a.  1 

b.  0 

c.  3 

d.  2 

Question number: 669
Question
A man rows downstream 30 km and upstream 18 km, taking 5 hours each time. The velocity of current is ________
Choices
Choice (4)  Response  

a.  6 km/hr 

b.  1.2 km/hr 

c.  3.6 km/hr 

d.  2.4 km/hr 

Question number: 670
» Introduction to Euclid's Geometry
Question
According to Euclid, a point has________
Choices
Choice (4)  Response  

a.  No length, no breadth and no thickness 

b.  No Length but breadth and thickness 

c.  Length, breadth and thickness 

d.  Length and breadth but no thickness 

Question number: 671
» Linear Equations in Two Variables
Question
The number of values of k for which the system of equations , has the solutions?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

