IMO Mathematics Olympiad Class 7: Questions 474  479 of 1012
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Question number: 474
Question
Two equal containers are filled with a mixture of sunfloweroil and fortuneoil. The concentration of sunfloweroil in each of the containers is 10 % and 15 % respectively. What is ratio of fortuneoil in both the containers respectively?
Choices
Choice (4)  Response  

a.  5: 6 

b.  6: 5 

c.  18: 17 

d.  17: 18 

Question number: 475
Question
By selling a shirt for Rs. 285 a shopkeeper loses 5%. At what price should he sell the shirt so as to gain 15%?
Choices
Choice (4)  Response  

a.  Rs. 295 

b.  Rs. 345 

c.  Rs. 325 

d.  Rs. 300 

Question number: 476
Question
A diver was diving 80 meters below sea level. He went down 50 meters more and came up 40 meters. How far below sea level did he dives?
Choices
Choice (4)  Response  

a.  meters 

b.  meters 

c.  meters 

d.  meters 

Question number: 477
Question
Kiran answered of the questions on her quiz correctly. What percent of the questions did she answer incorrectly?
Choices
Choice (4)  Response  

a.  75% 

b.  50% 

c.  34% 

d.  25% 

Question number: 478
Question
Jimmy’s and her mother both had birthdays last month. The sum of their ages is 75 years. His mother’s age is 4 times Jimmy’s age. What is age of Jimmy’s mother?
Choices
Choice (4)  Response  

a.  50 years 

b.  45 years 

c.  60 years 

d.  15 years 

Question number: 479
Question
Each of two groups of tourists has 30 students. If of the first group and of the second group board buses to travel to a tour, how many more students of the first group board buses than of the second group?
Choices
Choice (4)  Response  

a.  4 

b.  5 

c.  40 

d.  2 
