IMO Mathematics Olympiad Class 8: Questions 518  523 of 1029
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Question number: 518
» Direct and Inverse Proportions
Question
For a group of 20 students food lasts for 55 days. For how many days will the same food last for 50 students?
Choices
Choice (4)  Response  

a.  12 days 

b.  11 days 

c.  22 days 

d.  21 days 

Question number: 519
Question
Match the following provided that a and b are any rational numbers different from zero andx, y are any rational numbers.ListⅠ (Terms With Same Base Different Exponents)  ListⅡ (Uses Of Basic Exponent Rule) 

(A)
 (i)

(B)
 (ii)

(C)
 (iii)

Choices
Choice (4)  Response  

 
a. 


b. 


c. 


d. 


Question number: 520
» Direct and Inverse Proportions
Question
can do a piece of work in 60 days. He works at it for 10 days and then alone finishes the work in 42 days. The two together could have completed the work in ________.
Choices
Choice (4)  Response  

a.  22 days 

b.  20 days 

c.  30 days 

d.  25 days 

Question number: 521
» Direct and Inverse Proportions
Question
For a group of 15 students food lasts for 50 days. For how many days will the same food last for 75 students?
Choices
Choice (4)  Response  

a.  15 days 

b.  25 days 

c.  10 days 

d.  20 days 

Question number: 522
Question
The value of is________.
Choices
Choice (4)  Response  

a.  4 

b.  5 

c.  2 

d.  1 

Question number: 523
Question
If , then is________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

