Mental AbilityBasic Arithmetic (NCO Cyber Olympiad Class 7): Questions 80  86 of 122
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Question number: 80
» Mental Ability » Basic Arithmetic
Question
A boat covers a certain distance downstream in 2 hour, while it comes back in 1 hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?
Choices
Choice (4)  Response  

a.  15 kmps 

b.  8 kmps 

c.  11 kmps 

d.  13 kmps 

Question number: 81
» Mental Ability » Basic Arithmetic
Question
If each side of a square is doubled, its area
Choices
Choice (4)  Response  

a.  Becomes 8 times 

b.  Becomes 6 times 

c.  Becomes 4 times 

d.  Is doubled 

Question number: 82
» Mental Ability » Basic Arithmetic
Question
What percent of is ?
Choices
Choice (4)  Response  

a.  2.5% 

b.  25% 

c.  0.4% 

d.  6.6% 

Question number: 83
» Mental Ability » Basic Arithmetic
Question
The average age of 30 children in a class is 10 years. If the teacher’s age is included, the average age becomes 12 years. Find the teacher’s age.
Choices
Choice (4)  Response  

a.  42 

b.  72 

c.  35 

d.  45 

Question number: 84
» Mental Ability » Basic Arithmetic
Question
Choices
Choice (4)  Response  

a.  2190 

b.  19418 

c.  5012.5 

d.  19578 

Question number: 85
» Mental Ability » Basic Arithmetic
Question
A, B, C subscribe Rs. 60, 000 for a business. A subscribes Rs. 4000 more than B and B Rs. 3000 more than C. Then C’s share is________.
Choices
Choice (4)  Response  

a.  Rs. 8400 

b.  Rs. 11, 900 

c.  Rs. 13, 600.50 

d.  Rs. 16, 666.66 

Question number: 86
» Mental Ability » Basic Arithmetic
Question
A train 200 m long is running at a speed of In what time will it pass a bridge 100 m long?
Choices
Choice (4)  Response  

a.  45.55 sec 

b.  43.5 sec 

c.  42.30 sec 

d.  40.13 sec 
