IMO Mathematics Olympiad (SOF) Class 8: Questions 545  552 of 1030
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Question number: 545
» Direct and Inverse Proportions
Question
If A: B = 1: 4 and B: C = 3: 5, then C: A is equal to, ________.
Choices
Choice (4)  Response  

a.  24: 15 

b.  25: 14 

c.  3: 20 

d.  20: 3 

Question number: 546
Question
The solution of , is________.
Choices
Choice (4)  Response  

a.  2 

b.  4 

c.  3 

d.  1 

Question number: 547
» Direct and Inverse Proportions
Question
can do a piece of work in 70 days. He works at it for 7 days and then alone finishes the work in 40 days. The two together could have completed the work in ________.
Choices
Choice (4)  Response  

a.  30 days 

b.  23.8 days 

c.  20.5 days 

d.  23 days 

Question number: 548
Question
The value of , is________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 549
» Direct and Inverse Proportions
Question
Two pipes A and B can fill a tank in 12 and 24 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?
Choices
Choice (4)  Response  

a.  2 minutes 

b.  6 minutes 

c.  5 minutes 

d.  8 minutes 

Question number: 550
Question
Which of the following values are equal?
(1) (2) (3) (4)
Choices
Choice (4)  Response  

a.  2 and 3 

b.  1 and 2 

c.  1 and 3 

d.  1 and 4 

Question number: 551
Question
Simplify:
Choices
Choice (4)  Response  

a. 


b.  1 

c. 


d. 


Question number: 552
Question
Given that and, then the value of is (approximately) ________.
Choices
Choice (4)  Response  

a.  4.21 

b.  4.00 

c.  4.39 

d.  4.57 
