IMO Level 1 Mathematics Olympiad (SOF) Class 10: Questions 512  517 of 968
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Question number: 512
Question
Five years ago, a father was four times as old as his son. 8 years later, father’s age will be exceeding his son’s age by 12 years. The ratio of the present ages of father and son is ________
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 513
Question
5 bells commence tolling together and toll at intervals of 3,6, 9,12 and 15 seconds respectively. In 12 minutes, how many times do they toll together?
Choices
Choice (4)  Response  

a.  7  
b.  4  
c.  6  
d.  5 
Question number: 514
Question
The present ages of A, B and C are in proportions . Eight years ago, the sum of their ages was 76. What are their present ages (in years)?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 515
Question
Kamla got married 6 years ago. Today her age is times her age at the time of marriage. Her son’s age is times her age. Her son’s age is ________
Choices
Choice (4)  Response  

a.  3 years  
b.  2 years  
c.  5 years  
d.  4 years 
Question number: 516
Question
2 men and 7 boys can do a piece of work in 14 day, 3 men and 8 boys can do the same in 11 days. 8 men and 6 boys can do 3 times the amount of this work in ________
Choices
Choice (4)  Response  

a.  18 days  
b.  21 days  
c.  36 days  
d.  24 days 
Question number: 517
Question
P is twice good a workman as Q and therefore is able to finish a job in 30 days less than Q. Working together they can do it in ________ days.
Choices
Choice (4)  Response  

a.  50  
b.  30  
c.  20  
d.  40 