IMO Mathematics Olympiad Class 9: Questions 779  781 of 919
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Question number: 779
» Analytical Reasoning and Logical Reasoning
Question
In the following list of letters how many D’s are followed by F but not preceded by E?
X M N D F P R S T D D F O C E D F B T E D K
Choices
Choice (4)  Response  

a.  4 

b.  3 

c.  2 

d.  1 

Question number: 780
» Analytical Reasoning and Logical Reasoning
Question
Which of the following numbers is present only in one figure?
Choices
Choice (4)  Response  

a.  4 

b.  5 

c.  3 

d.  7 

Question number: 781
Question
The owner of a plant nursery wanted to test the effectiveness of a new type of fertilizer. He measured the heights of 5 plants, and then gave each an equal amount of fertilizer. Two weeks later, he measured the heights of the plants again. The graph shows the height of the plants before and after the addition of fertilizer.
What was mean growth of the plants, to the nearest tenth of a centimeter?
Choices
Choice (4)  Response  

a.  4.5 cm 

b.  6 cm 

c.  5.5 cm 

d.  5 cm 
