IMO Mathematics Olympiad (SOF) Class 7: Questions 503  508 of 1012
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Question number: 503
Question
There are 7 marbles in a box in which 5 are red and 2 are blue. What is the probability of getting a red marble?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 504
Question
The cost price of earrings is Rs. 5200 and the loss percent is . Find the selling price of the earrings.
Choices
Choice (4)  Response  

a.  Rs. 5540 

b.  Rs. 3850 

c.  Rs. 4250 

d.  Rs. 5850 

Question number: 505
Question
Each of two groups of tourists has 60 people. If of the first group and of the second group board buses to travel to a museum, how many more people of the first group board buses than of the second group?
Choices
Choice (4)  Response  

a.  4 

b.  2 

c.  40 

d.  5 

Question number: 506
Question
Aman’s mother was 21 years old when his sister was born. His father is 8 years older than his mother. Now Aman is 17 years old and his sister is 3 years older than him. What is the present age of Aman’s father?
Choices
Choice (4)  Response  

a.  47 years 

b.  46 years 

c.  50 years 

d.  49 years 

Question number: 507
Question
A library has 52 videotapes that can be checked out. On Monday the librarian counted 17 videotapes still on the shelf. How many videotapes were checked out from the library?
Choices
Choice (4)  Response  

a.  44 

b.  45 

c.  35 

d.  69 

Question number: 508
Question
The ratio of computers to mobiles in a shop is 6: 5. There are 32 fewer mobiles than computers. What is the total number of mobiles and computers in the shop?
Choices
Choice (4)  Response  

a.  352 

b.  215 

c.  192 

d.  160 
