Mental Ability (NCO Cyber Olympiad Class 7): Questions 73  79 of 205
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Question number: 73
» Mental Ability » Basic Arithmetic
Question
A cistern can be filled by two tapes A and B in 3 hours and 2 hours respectively. How much time will the cistern be filled up completely?
Choices
Choice (4)  Response  

a.  3.07 hours 

b.  2.4 hours 

c.  1.2 hours 

d.  3.6 hours 

Question number: 74
» Mental Ability » Basic Arithmetic
Question
A boat covers a certain distance downstream in 1 hour, while it comes back in 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.  12 kmps 

b.  15 kmps 

c.  14 kmps 

d.  13 kmps 

Question number: 75
» Mental Ability » Number Games
Question
What is the sum of two consecutive even numbers, the difference of whose squares is 164?
Choices
Choice (4)  Response  

a.  46 

b.  38 

c.  82 

d.  34 

Question number: 76
» Mental Ability » Basic Arithmetic
Question
If each side of a cube is doubled, its volume
Choices
Choice (4)  Response  

a.  Becomes 6 times 

b.  Becomes 8 times 

c.  Becomes 4 times 

d.  Is doubled 

Question number: 77
» Mental Ability » Basic Arithmetic
Question
In an election, two candidates contested. A candidate secured 30 % of the valid votes and is elected by a majority of 150 votes. Find the total number of valid votes.
Choices
Choice (4)  Response  

a.  375 

b.  570 

c.  400 

d.  510 

Question number: 78
» Mental Ability » Basic Arithmetic
Question
Simplify:
Choices
Choice (4)  Response  

a.  10 

b.  20 

c.  11 

d.  21 

Question number: 79
» Mental Ability » Basic Arithmetic
Question
An ore contain 9 % lead. How many kilograms of the ore are required to get 60 kg of lead?
Choices
Choice (4)  Response  

a.  666.66 kg 

b.  850.78 kg 

c.  544 kg 

d.  144.22 kg 
