IMO Mathematics Olympiad Class 9: Questions 855  861 of 919
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Question number: 855
Question
Age of Smith’s father is 4 times of his age. If 5 years ago, father’s age was 7 times of the age of his son at that time. What is Smith’s father present age?
Choices
Choice (4)  Response  

a.  51 years 

b.  60 years 

c.  40 years 

d.  45 years 

Question number: 856
Question
If , then , is ________.
Choices
Choice (4)  Response  

a.  1 

b.  2 

c.  0 

d.  3 

Question number: 857
Question
A and B invest in a business in the ratio . If of the total profit goes to charity and A’s share is Rs. 855, the total profit is ________
Choices
Choice (4)  Response  

a.  Rs. 1576 

b.  Rs. 1425 

c.  Rs. 1537.50 

d.  Rs. 1500 

Question number: 858
Question
If the mean of 17 observations is 22 and that of another 18 observations is 10, then the mean of 35 observations is ________
Choices
Choice (4)  Response  

a.  24 

b.  15.83 

c.  15 

d.  24.8 

Question number: 859
» Introduction to Euclid's Geometry
Question
The ratio of two supplementary angles is , What is the measure of the greater angle?
Choices
Choice (4)  Response  

a.  120˚ 

b.  100˚ 

c.  140˚ 

d.  160˚ 

Question number: 860
Question
Two dice are thrown simultaneously. The probability of getting an even number as the sum is________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 861
Question
The median of the following numbers 45, 36, 88, 65, 44, 21, 85, 47, 74 is________
Choices
Choice (4)  Response  

a.  47 

b.  54 

c.  88 

d.  74 
