Mental AbilityBasic Arithmetic (NCO Cyber Olympiad Class 7): Questions 116  121 of 122
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Question number: 116
» Mental Ability » Basic Arithmetic
Question
The ratio of the number of boys and girls in a college is 4: 3. If the percentage increase in the number of boys and girls be 17 % and 22 % respectively, what will be the new ratio?
Choices
Choice (4)  Response  

a.  12: 21 

b.  5: 9 

c.  21: 22 

d.  34: 33 

Question number: 117
» Mental Ability » Basic Arithmetic
Question
A boat covers a certain distance downstream in 1 hour, while it comes back in 1 hours. If the speed of the stream be 2 kmph, what is the speed of the boat in still water?
Choices
Choice (4)  Response  

a.  11 kmps 

b.  15 kmps 

c.  5 kmps 

d.  8 kmps 

Question number: 118
» Mental Ability » Basic Arithmetic
Question
What percent of is ?
Choices
Choice (4)  Response  

a.  20% 

b.  25% 

c.  0.4% 

d.  2.5% 

Question number: 119
» Mental Ability » Basic Arithmetic
Question
The present ages of three persons in proportions 3: 6: 9. Five years ago, the sum of their ages was 57. Find their present ages (in years).
Choices
Choice (4)  Response  

a.  12, 24, 36 

b.  18, 32, 15 

c.  15, 30, 45 

d.  All of the above 

Question number: 120
» Mental Ability » Basic Arithmetic
Question
A farmer has 2 grasshoppers of the same species. The corresponding parts of the grasshopper’s bodies are proportional. The larger grasshopper has an 8 cm body and a 1.5 cm forelimb. The smaller grasshopper has a 1.2 cm forelimb. How long is the body of the smaller grasshopper?
Choices
Choice (4)  Response  

a.  10.0 cm 

b.  6.4 cm 

c.  6.0 cm 

d.  7.7 cm 

Question number: 121
» Mental Ability » Basic Arithmetic
Question
A farmer has 2 grasshoppers of the same species. The corresponding parts of the grasshopper’s bodies are proportional. The larger grasshopper has an 15 cm body and a 10 cm forelimb. The smaller grasshopper has a 20 cm forelimb. How long is the body of the smaller grasshopper?
Choices
Choice (4)  Response  

a.  40 cm 

b.  70 cm 

c.  30 cm 

d.  50 cm 
