IMO Mathematics Olympiad (SOF) Class 8: Questions 795  800 of 1030
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Question number: 795
Question
A ladder 10 meters long reaches a window which is 6 meters above the ground on one side of a street. Keeping its foot at the same point, the ladder is turned to other side of the street to reach a window 8 meters high. The width of the street is ________.
Choices
Choice (4)  Response  

a.  12 m 

b.  14 m 

c.  10 m 

d.  11 m 

Question number: 796
Question
The average age of 5 students is 70 years and their ages are in proportion 3: 5: 7: 9: 11, the age of youngest girl is________.
Choices
Choice (4)  Response  

a.  40 years 

b.  10 years 

c.  30 years 

d.  35 years 

Question number: 797
Question
Manoj earns 25000 per month. He spends on household items and on education of his children. The amount he saves is________.
Choices
Choice (4)  Response  

a.  Rs. 6700 

b.  Rs. 5370 

c.  Rs. 20,220 

d.  Rs. 10,000 

Question number: 798
Question
The ratio of boys and girls in Reena’s classes is 2: 3. Which of the following ratio is not equivalent to 2: 3?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 799
Question
Find the compound interest on Rs. 10,000 in 2 years at 4 % per annum, the interest being compounded halfyearly
Choices
Choice (4)  Response  

a.  Rs. 824.32 

b.  Rs. 885.20 

c.  Rs. 800 

d.  Rs 825.23 

Question number: 800
Question
Sixty five percent of a number is 21 less than four fifth of that number. What is the number?
Choices
Choice (4)  Response  

a.  140 

b.  100 

c.  150 

d.  160 
