IMO Mathematics Olympiad (SOF) Class 10: Questions 379  384 of 958
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Question number: 379
Question
The average temperatures of Monday, Tuesday, Wednesday and Thursday was . The average temperature of Tuesday, Wednesday, Thursday and Friday was . If the temperature on Monday was , then the temperature on Friday was ________.
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Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 380
Question
If the centroid of the triangle formed by the points is at the origin, then
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Choice (4)  Response  

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c. 


d. 


Question number: 381
Question
The mean of ten numbers is 60. If one number is excluded, then their mean is 50, the excluded number is ________
Choices
Choice (4)  Response  

a.  130 

b.  160 

c.  140 

d.  150 

Question number: 382
Question
Find the area of the triangle whose vertices are and
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Choice (4)  Response  

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Question number: 383
Question
XYZ is an isosceles triangle. If the coordinates of the base are, then the coordinates of the vertex Z can be
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Choice (4)  Response  

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d. 


Question number: 384
Question
The mean of 7 observations is 20. If the mean of the first 4 observations is 20 and that of the last 4 observations is 16, then the Fourth observation is ________
Choices
Choice (4)  Response  

a.  3 

b.  7 

c.  8 

d.  4 
