IMO Mathematics Olympiad (SOF) Class 8: Questions 498  505 of 1029
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Question number: 498
» Direct and Inverse Proportions
Question
A bag contains 25 paise, 10 paise and 5 paise coins in the ratio 2: 3: 4. If their total value is Rs. 20, the number of 5 paise coins is ________.
Choices
Choice (4)  Response  

a.  50 

b.  80 

c.  60 

d.  70 

Question number: 499
Question
If and, then is equal to________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 500
» Direct and Inverse Proportions
Question
Two numbers are in the ratio 1: 3. If each number is increased by 9, the ratio becomes 3: 5. The numbers are________.
Choices
Choice (4)  Response  

a.  13,14 

b.  3.5,14.7 

c.  35,25 

d.  4.5,13.5 

Question number: 501
Question
The value of is ________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 502
» 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: 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 
