IMO Level 1 Mathematics Olympiad (SOF) Class 8: Questions 498  506 of 1040
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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.  80  
b.  70  
c.  60  
d.  50 
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.  4.5,13.5  
b.  13,14  
c.  3.5,14.7  
d.  35,25 
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.  30  
b.  50  
c.  40  
d.  60 
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.  20 days  
b.  17 days  
c.  21 days  
d.  18 days 
Question number: 504
Question
Number of prime factors in is
Choices
Choice (4)  Response  

a.  4  
b.  2  
c.  6  
d.  3 
Question number: 505
Question
If, then the value of is________.
Choices
Choice (4)  Response  

a.  3  
b.  1  
c.  2  
d.  4 
Question number: 506
» 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.  3.5  
b.  4  
c.  5  
d.  3 