IMO Mathematics Olympiad Class 9: Questions 683  687 of 919
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Question number: 683
Question
The average of n numbers is A. if is replaced by is replaced by , …, then the new average is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 684
Question
One quality of wheat at Rs. 9.30 per kg is mixed with another quality at a certain rate in the ratio . If the mixture so formed be worth Rs. 10 per kg, what is the rate per kg of the second quality of wheat?
Choices
Choice (4)  Response  

a.  Rs. 10.60 

b.  Rs. 10.30 

c.  Rs. 11 

d.  Rs. 10.80 

Question number: 685
Question
A bicycle is sold at a gain of . If it had been sold for Rs. 20 more, would have been gained. The C. P. of the bicycle is ________
Choices
Choice (4)  Response  

a.  Rs. 400 

b.  Rs. 600 

c.  Rs. 500 

d.  Rs. 350 

Question number: 686
Question
A certain number of men can finish a piece of work in 100 days. If there were 10 men less, it would take 10 days more for the work to be finished. How many men were there originally?
Choices
Choice (4)  Response  

a.  147 

b.  146 

c.  110 

d.  75 

Question number: 687
Question
The King, queen and jack of clubs are removed from a deck of 52 cards and then wellshuffled. One card id selected from the remaining cards. The probability of getting a black card is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

