Direct and Inverse Proportions (IMO Mathematics Olympiad Class 8): Questions 14  20 of 62
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Question number: 14
» 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: 15
» 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: 16
» Direct and Inverse Proportions
Question
If and, then the value of is ________.
Choices
Choice (4)  Response  

a.  8 

b.  6 

c.  9 

d.  10 

Question number: 17
» Direct and Inverse Proportions
Question
The weight of a 12 m long iron rod is 20.5 kg. The weight of 5 m long of such rod will be________.
Choices
Choice (4)  Response  

a.  8 kg 

b.  9 kg 

c.  8.54 kg 

d.  9.5 kg 

Question number: 18
» Direct and Inverse Proportions
Question
The weight of a 15 m long iron rod is 25 kg. The weight of 10 m long of such rod will be________.
Choices
Choice (4)  Response  

a.  18 kg 

b.  16 kg 

c.  16.6 kg 

d.  18.54 kg 

Question number: 19
» Direct and Inverse Proportions
Question
A can do a work in 8 days. If B is 60 % more efficient than A, then in how many days can B do the same work?
Choices
Choice (4)  Response  

a.  3.5 

b.  3 

c.  5 

d.  4 

Question number: 20
» Direct and Inverse Proportions
Question
A man completes of a job in 10 days. At this rate how many more days will it take him to finish the job?
Choices
Choice (4)  Response  

a.  6 

b.  7.5 

c.  6.5 

d.  7 
