IMO Mathematics Olympiad (SOF) Class 9: Questions 817  821 of 919
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Question number: 817
Question
A student was asked to divide a number by 8 and add 16 to the quotient. He, however, first added 16 to the number and then divided it by 8, getting 160 as the answer. The correct answer should have been________
Choices
Choice (4)  Response  

a.  174 

b.  162 

c.  154 

d.  198 

Question number: 818
Question
Reema bought pens at Rs. 2.60 each and y getting cards at 80 paise each. If the pens cost Rs. 12 more than the cards, the equation involving x and y are ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 819
Question
P, Q and R enter into partnership by making investments in the ratio. After a year, R invests another Rs. 452500 while P withdrew Rs. 65400. The ratio of investments then changes to . How much did R invest initially?
Choices
Choice (4)  Response  

a.  Rs. 228900 

b.  Rs. 228990 

c.  Rs. 225899 

d.  Rs. 224516 

Question number: 820
Question
The value of =________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 821
» Analytical Reasoning and Logical Reasoning
Question
There are three pillars X, Y and Z of different heights. Three spiders A, B and C start to climb on these pillars simultaneously. In one chance A climbs on X 5 cm but slips down 1 cm. B climbs on Y 6 cm but slips down 3 cm. C climbs on Z 7 cm but slips down 2 cm. if each requires 50 chances to reach the top of the pillar, what is the height of the shortest pillar?
Choices
Choice (4)  Response  

a.  141 cm 

b.  153 cm 

c.  152 cm 

d.  144 cm 
