Mental AbilityBasic Arithmetic (NCO Cyber Olympiad Class 7): Questions 34  41 of 122
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Question number: 34
» Mental Ability » Basic Arithmetic
Question
The average of 3 results is 10 and that of the first two is 5. The third result is________.
Choices
Choice (4)  Response  

a.  1 

b.  12.5 

c.  20 

d.  50 

Question number: 35
» Mental Ability » Basic Arithmetic
Question
400 liters of milk is divided in two parts having ratio X: 20, if the first part is 200 liters, find x.
Choices
Choice (4)  Response  

a.  20 

b.  42 

c.  39 

d.  41 

Question number: 36
» Mental Ability » Basic Arithmetic
Question
Which of the following number is prime?
Choices
Choice (4)  Response  

a.  119 

b.  247 

c.  187 

d.  All a. , b. and c. are correct 

Question number: 37
» Mental Ability » Basic Arithmetic
Question
The ratio of the number of boys and girls in a college is 5: 6. If the percentage increase in the number of boys and girls be 10 % and 15 % respectively, what will be the new ratio?
Choices
Choice (4)  Response  

a.  5: 9 

b.  21: 22 

c.  8: 9 

d.  23: 24 

Question number: 38
» Mental Ability » Basic Arithmetic
Question
Find the value of in each of the following equations
Choices
Choice (4)  Response  

a.  0.5 

b.  5.4 

c.  0.6 

d.  1.6 

Question number: 39
» Mental Ability » Basic Arithmetic
Question
An ore contain 5 % Iron. How many kilograms of the ore are required to get 70 kg of Iron?
Choices
Choice (4)  Response  

a.  1.44 kg 

b.  850 kg 

c.  544 kg 

d.  1400 kg 

Question number: 40
» Mental Ability » Basic Arithmetic
Question
The average age of 20 children in a class is 8 years. If the teacher’s age is included, the average age becomes 10 years. Find the teacher’s age.
Choices
Choice (4)  Response  

a.  50 

b.  42 

c.  45 

d.  35 

Question number: 41
» Mental Ability » Basic Arithmetic
Question
If the area of a triangle with base is equal to the surface area of a cube with length of edge , and then the altitude of the triangle is
Choices
Choice (4)  Response  

a. 


b.  a 

c. 


d. 

