IMO Mathematics Olympiad Class 10: Questions 541  545 of 889
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Question number: 541
Question
A girl calculates that the probability of her winning the first prize in a lottery is 0.08. If 6000 tickets are sold, how many tickets has she bought?
Choices
Choice (4)  Response  

a.  750  
b.  240  
c.  40  
d.  480 
Question number: 542
Question
One year ago the ratio between Shravan’s and Pushkar’s salary was . The ratios of their individual salaries between last year’s and this year’s salaries are and respectively. At present, the total of their salary is Rs. 3420. The salary of Pushkar’s now, is ________
Choices
Choice (4)  Response  

a.  Rs. 1640  
b.  Rs. 1740  
c.  Rs. 1440  
d.  Rs. 1540 
Question number: 543
Question
The Noida office of HP has 2000 executives. Of these 1200 use Saurashtra mail and 700 use Gujarat mail. 200 use both Saurashtra and the Gujarat mail. If an executive is picked at random, what is the probability that he has used Gujarat mail?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 544
Question
3 men and 10 boys can do a piece of work in 8 day, 3 men and 6 boys can do the same in 10 days. 5 men and 10 boys can do 4 times the amount of this work in ________
Choices
Choice (4)  Response  

a.  52 days  
b.  32 days  
c.  42 days  
d.  22 days 
Question number: 545
Question
One year ago the ratio between Ram’s and Bharat’s salary was . The ratios of their individual salaries between last year’s and this year’s salaries are and respectively. At present the total of their salary is Rs. 1890. The salary of Ram’s now, is ________
Choices
Choice (4)  Response  

a.  Rs. 1575  
b.  Rs. 1975  
c.  Rs. 1875  
d.  Rs. 2175 