Direct and Inverse Proportions (IMO Mathematics Olympiad Class 8): Questions 7  13 of 62
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Question number: 7
» Direct and Inverse Proportions
Question
The ratio of boys and girls in a school of 660 students is. How many girls should be admitted to make ratio?
Choices
Choice (4)  Response  

a.  50 

b.  60 

c.  40 

d.  30 

Question number: 8
» 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: 9
» 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: 10
» 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: 11
» Direct and Inverse Proportions
Question
If and, then the value of is ________.
Choices
Choice (4)  Response  

a.  15 

b.  65 

c.  85 

d.  75 

Question number: 12
» Direct and Inverse Proportions
Question
Two numbers are in the ratio 5: 7. If each number is increased by 14, the ratio becomes 7: 9. The numbers are________.
Choices
Choice (4)  Response  

a.  35, 47 

b.  25, 35 

c.  35, 25 

d.  35, 49 

Question number: 13
» 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 
