Mental AbilityBasic Arithmetic (NCO Cyber Olympiad Class 7): Questions 52  57 of 122
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Question number: 52
» Mental Ability » Basic Arithmetic
Question
An ore contain 8 % copper. How many kilograms of the ore are required to get 68 kg of copper?
Choices
Choice (4)  Response  

a.  85 kg 

b.  850 kg 

c.  544 kg 

d.  5.44 kg 

Question number: 53
» Mental Ability » Basic Arithmetic
Question
The cost of cultivating a square field at the rate of rupees 360 per hectare is rupees 3240. What is the cost of putting a fence around it at 75 paise per meter?
Choices
Choice (4)  Response  

a.  600 rupees 

b.  900 rupees 

c.  700 rupees 

d.  800 rupees 

Question number: 54
» Mental Ability » Basic Arithmetic
Question
If 30 men working 8 hours a day can do a piece of work in 15 days, in how days will 15 men working for 7 hours a day to do the same piece of work?
Choices
Choice (4)  Response  

a.  55 days 

b.  34.28 days 

c.  30 days 

d.  12 days 

Question number: 55
» Mental Ability » Basic Arithmetic
Question
A train 600 meters long is running at a speed of If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is.
Choices
Choice (4)  Response  

a.  500 

b.  130 

c.  300 

d.  360 

Question number: 56
» Mental Ability » Basic Arithmetic
Question
A cistern can be filled by two tapes A and B in 5 hours and 8 hours respectively. How much time will the cistern be filled up completely?
Choices
Choice (4)  Response  

a.  3.08 hours 

b.  24 hours 

c.  48 hours 

d.  3.6 hours 

Question number: 57
» Mental Ability » Basic Arithmetic
Question
8 children and 12 men completed a certain piece of work in 9 days. Each children takes twice the time taken by a man to finish the work. In how many days will 12 men finish the same work?
Choices
Choice (4)  Response  

a.  9 

b.  12 

c.  8 

d.  15 
