IMO Level 1 Mathematics Olympiad (SOF) Class 8: Questions 818  823 of 1040
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Question number: 818
Question
At what rate percent per annum will a sum of money double in 10 years?
Choices
Choice (4)  Response  

a.  5%  
b.  20%  
c.  10%  
d.  15% 
Question number: 819
Question
The ratio of two numbers is 1: 2. Which of the following ratio is equivalent to 1: 2?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 820
Question
A rectangular sheet of paper 30 cm X 18cm can be transformed into a right circular cylinder in two ways  by rolling the paper along its length or by rolling it along its breadth. Find the ratio of the volume of two cylinders formed.
Choices
Choice (4)  Response  

a.  5: 3  
b.  1: 5  
c.  4: 3  
d.  3: 2 
Question number: 821
Question
A ladder is leaning against a house. The distance from the top of the ladder to the ground is 12 feet, and the distance from the foot of the ladder to the house is 4 feet. How tall is the ladder?
Choices
Choice (4)  Response  

a.  13 feet  
b.  12.65 feet  
c.  12 feet  
d.  None of the above 
Question number: 822
Question
Roshni’s age after 15 years will be 5 times his age 5 years back. What is the present age of Roshni?
Choices
Choice (4)  Response  

a.  25 years  
b.  10 years  
c.  20 years  
d.  30 years 
Question number: 823
Question
The average age of 2 boys is 14 years and their ages are in proportion 2: 5, the age of youngest girl is________.
Choices
Choice (4)  Response  

a.  8 years  
b.  9 years  
c.  10 years  
d.  4 years 