IMO Mathematics Olympiad Class 8: Questions 503  510 of 1029
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Question number: 503
» Direct and Inverse Proportions
Question
can do a piece of work in 50 days. He works at it for 5 days and then alone finishes the work in 30 days. The two together could have completed the work in ________.
Choices
Choice (4)  Response  

a.  17.5 days 

b.  17 days 

c.  18 days 

d.  17.2 days 

Question number: 504
Question
Number of prime factors in is
Choices
Choice (4)  Response  

a.  3 

b.  4 

c.  2 

d.  6 

Question number: 505
Question
If, then the value of is________.
Choices
Choice (4)  Response  

a.  1 

b.  3 

c.  4 

d.  2 

Question number: 506
» Direct and Inverse Proportions
Question
A can do a work in 3 days. If B is 25 % less efficient than A, then in how many days can B do the same work?
Choices
Choice (4)  Response  

a.  3 

b.  4 

c.  5 

d.  3.5 

Question number: 507
» Direct and Inverse Proportions
Question
The ratio of boys and girls in a school of 910 students is. How many girls should be admitted to make ratio?
Choices
Choice (4)  Response  

a.  130 

b.  260 

c.  210 

d.  240 

Question number: 508
Question
If , then is________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 509
Question
The value of when is________.
Choices
Choice (4)  Response  

a.  4 

b.  1 

c.  2 

d.  5 

Question number: 510
Question
The standard form of 0.003445 is________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 
