IMO Mathematics Olympiad Class 10: Questions 502  507 of 889
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Question number: 502
Question
The mean of 10 observations is . By error, one observation was noted as was misread as 24. Then the correct mean is ________
Choices
Choice (4)  Response  

a.  21  
b.  27  
c.  25  
d.  23 
Question number: 503
Question
The distance between the points and is ________
Choices
Choice (4)  Response  

a.  3a  
b.  2a  
c.  a  
d.  5a 
Question number: 504
Question
A drawer contains 8 red socks, 12 white socks and 10 blue socks. Without looking you draw out a sock and then draw out a second sock without returning the first sock. What is the probability that the first sock and second sock are both white?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 505
Question
If 2 man or 3 women or 4 boys can do a piece of work in 60 days, then the same piece of work will be done by 1 man, 1 woman and 1 boy in ________
Choices
Choice (4)  Response  

a.  51 days  
b.  50 days  
c.  49 days  
d.  52 days 
Question number: 506
Question
Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together?
Choices
Choice (4)  Response  

a.  16  
b.  10  
c.  4  
d.  15 
Question number: 507
Question
Ramesh travels a certain distance at 6 km/hr and reaches 20 min. late. If he travels at 8 km/hr, he reaches 20 min. earlier. The distance he has to travel is ________
Choices
Choice (4)  Response  

a.  8 km  
b.  6 km  
c.  7 km  
d.  5 km 