IMO Mathematics Olympiad (SOF) Class 8: Questions 835  840 of 1029
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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 

Question number: 839
Question
Out of a number of electronics item. Ram purchases 60 % washing machines 2 % of these are found to be defective. The percentage of defective washing machine in all is________.
Choices
Choice (4)  Response  

a.  1.2% 

b.  3.5% 

c.  5.5% 

d.  4.0% 

Question number: 840
Question
Tarun goes to a shop to buy a shirt costing Rs. 1000 including sales tax of 15%. He asks the shopkeeper to reduce the price of the watch so that he can save an amount equal to the sales tax. The reduction in the price of the sari is________.
Choices
Choice (4)  Response  

a.  Rs 120 

b.  Rs 150 

c.  Rs 250 

d.  None of the above 
