IMO Mathematics Olympiad Class 8: Questions 832  838 of 1029
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Question number: 832
Question
Dishant gets 2 marks for each correct answer and loses 1 marks for each wrong answer. He attempts 60 problems and obtains 15 marks. The number of problem solved correctly is________.
Choices
Choice (4)  Response  

a.  25 

b.  18 

c.  10 

d.  21 

Question number: 833
Question
If students of a class of strength 90 are girls, then number of boys equals________.
Choices
Choice (4)  Response  

a.  50 

b.  30 

c.  40 

d.  10 

Question number: 834
Question
Vimal is traveling at an average rate of 40 miles per hour. How far does he travel in 1 hours?
Choices
Choice (4)  Response  

a.  60 miles 

b.  100 miles 

c.  50 miles 

d.  20 miles 

Question number: 835
Question
The average age of 4 boys is 25 years and their ages are in proportion 1: 2: 3: 4, the age of youngest girl is________.
Choices
Choice (4)  Response  

a.  4 years 

b.  5 years 

c.  10 years 

d.  9 years 

Question number: 836
Question
Two pens and three pencils cost Rs. 80. Four pens and a pencils cost Rs. 112. Find the cost of the pen.
Choices
Choice (4)  Response  

a.  11 

b.  25 

c.  30 

d.  35 

Question number: 837
Question
The total area of a semicircle and a rectangle is equal to 177 sq. cm. The diameter of the circle is 14 cm and the length of the rectangle is 20 cm. The perimeter of a rectangle is________.
Choices
Choice (4)  Response  

a.  40 cm 

b.  60 cm 

c.  55 cm 

d.  50 cm 

Question number: 838
Question
The average age of 3 girls is 15 years and their ages are in proportion 3: 5: 7, the age of youngest girl is________.
Choices
Choice (4)  Response  

a.  4 years 

b.  9 years 

c.  5 years 

d.  10 years 
