Mental Ability (NCO Cyber Olympiad Class 7): Questions 68  72 of 205
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Question number: 68
» Mental Ability » Basic Algebra
Question
If and are any two rational numbers then we define:
Thus, subtracting a rational number means adding its additive inverse.
Based on the statement given above solve the following problem: Subtract from .
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 69
» Mental Ability » Basic Algebra
Question
If and be any two rational numbers then we define:
Thus, subtracting a rational number means adding its additive inverse. Based on the statement given above solve the following Problem: Subtract from .
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 70
» Mental Ability » Basic Arithmetic
Question
A cistern can be filled by two tapes A and B in 12 hours and 16 hours respectively. The full cistern can be emptied by a third tap C in 8 hours. If all the taps were turned on at the same time, in how much time will the empty cistern be filled up completely?
Choices
Choice (4)  Response  

a.  36 hours 

b.  40 hours 

c.  24 hours 

d.  48 hours 

Question number: 71
» Mental Ability » Basic Statistics
Question
Which one of the following numbers is exactly divisible by 11?
Choices
Choice (4)  Response  

a.  2350 

b.  2444 

c.  3122 

d.  3905 

Question number: 72
» Mental Ability » Basic Arithmetic
Question
If 20 men working 7 hours a day can do a piece of work in 10 days, in how days will 15 men working for 8 hours a day to do the same piece of work?
Choices
Choice (4)  Response  

a.  11.66 days 

b.  55 days 

c.  30 days 

d.  12 days 
