IMO Mathematics Olympiad (SOF) Class 8: Questions 572  578 of 1030
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Question number: 572
» Direct and Inverse Proportions
Question
If A: B = 3: 4 and B: C = 5: 6, then C: A is equal to, ________.
Choices
Choice (4)  Response  

a.  15: 14 

b.  24: 15 

c.  12: 23 

d.  25: 14 

Question number: 573
Question
The value of when is________.
Choices
Choice (4)  Response  

a.  80 

b.  81 

c.  85 

d.  84 

Question number: 574
» Direct and Inverse Proportions
Question
A cistern has two inlets A and B which can fill it in 10 minutes and 20 minutes respectively. An outlet C can empty the full cistern in 4 minutes. If all the pipes are opened together in the empty tank, time taken to fill the tank completely is ________.
Choices
Choice (4)  Response  

a.  25 minutes 

b.  20 minutes 

c.  15 minutes 

d.  10 minutes 

Question number: 575
Question
Number of prime factors in is
Choices
Choice (4)  Response  

a.  73 

b.  60 

c.  66 

d.  70 

Question number: 576
» Direct and Inverse Proportions
Question
A water tank is twofifth full. Pipe A can fill a tank in 12 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?
Choices
Choice (4)  Response  

a.  4.8 minutes 

b.  5 minutes 

c.  4 minutes 

d.  5.5 minutes 

Question number: 577
Question
If, then the value of is________.
Choices
Choice (4)  Response  

a.  2 

b.  4 

c.  1 

d.  3 

Question number: 578
Question
When simplified, is equal to________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

