IMO Mathematics Olympiad (SOF) Class 8: Questions 579  585 of 1030
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Question number: 579
Question
Number of prime factors in is
Choices
Choice (4)  Response  

a.  4 

b.  9 

c.  6 

d.  8 

Question number: 580
» Direct and Inverse Proportions
Question
A man completes of a job in 12 days. At this rate how many more days will it take him to finish the job?
Choices
Choice (4)  Response  

a.  27 

b.  26 

c.  24 

d.  23 

Question number: 581
» Direct and Inverse Proportions
Question
can do a piece of work in 20 days and can do alone it in 10 days. B works at it for 5 days and then leaves. alone can finish the remaining work in________.
Choices
Choice (4)  Response  

a.  11 days 

b.  10 days 

c.  10.5 days 

d.  5 days 

Question number: 582
» Direct and Inverse Proportions
Question
Two numbers are in the ratio 7: 9. If each number is increased by 18, the ratio becomes 9: 11. The numbers are________.
Choices
Choice (4)  Response  

a.  35,81 

b.  63,85 

c.  65,35 

d.  63,81 

Question number: 583
» Direct and Inverse Proportions
Question
A bag contains 50 paise, 25 paise and 10 paise coins in the ratio 1: 2: 3. If their total value is Rs. 26, the number of 50 paise coins is ________.
Choices
Choice (4)  Response  

a.  80 

b.  20 

c.  30 

d.  50 

Question number: 584
» Direct and Inverse Proportions
Question
If , then the value of is________.
Choices
Choice (4)  Response  

a.  36 

b.  35 

c.  39 

d.  31 

Question number: 585
» Direct and Inverse Proportions
Question
A sum of money is sufficient to pay wages for 15 days and wages for 20 days. The same money is sufficient to pay the wages of both for ________.
Choices
Choice (4)  Response  

a.  10 days 

b.  days 

c.  days 

d.  8 days 
