Mental AbilityBasic Arithmetic (NCO Cyber Olympiad Class 7): Questions 42  46 of 122
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Question number: 42
» Mental Ability » Basic Arithmetic
Question
The ratio of the number of boys and girls in a college is 8: 9. If the percentage increase in the number of boys and girls were 20 % and 10 % respectively, what will be the new ratio?
Choices
Choice (4)  Response  

a.  96: 99 

b.  23: 24 

c.  8: 9 

d.  17: 18 

Question number: 43
» 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: 44
» 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 

Question number: 45
» 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: 46
» 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 
