IMO Level 1 Mathematics Olympiad (SOF) Class 7: Questions 406  413 of 1022
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Question number: 406
Question
When a number is reduced by 12, it becomes 20 % of itself. Find the number.
Choices
Choice (4)  Response  

a.  15 

b.  30 

c.  12 

d.  25 

Question number: 407
Question
The value of is ________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 408
Question
Two numbers are 15 % and 30 % less than a third number respectively. How much % is the second number less than the first?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 409
Question
A number P exceeds Q by 50%. By what percentage is P more than Q?
Choices
Choice (4)  Response  

a.  30% 

b.  50% 

c.  55% 

d.  35% 

Question number: 410
Question
Two numbers are in the ratio of 5: 4. If 5 be added to both, their ratio changes to 6: 5. The smaller number is ________.
Choices
Choice (4)  Response  

a.  25 

b.  32 

c.  36 

d.  20 

Question number: 411
Question
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 412
Question
A contractor employed 210 men to build a house in 60 days. After 12 days, he was joined by 70 more men. In how many days will the remaining work be finished?
Choices
Choice (4)  Response  

a.  40 days 

b.  36 days 

c.  38 days 

d.  35 days 

Question number: 413
Question
Step 1:
Step 2:
Step 3:
Are the above given steps showing simplification of algebraic expression
?
Choices
Choice (4)  Response  

a.  Yes 

b.  Only step 1 is correct 

c.  Only step 1 and 2 are correct 

d.  No 
