Mental AbilityBasic Arithmetic (NCO Cyber Olympiad Class 9): Questions 38  42 of 49
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Question number: 38
» Mental Ability » Basic Arithmetic
Question
Divide 45 among four parts such that 2 added to first part, 2 subtracted from second part, third multiplied by 2 and the fourth divided by2 are all equal.
Choices
Choice (4)  Response  

a.  5, 8, 12, 20 

b.  8, 12, 5, 20 

c.  12, 8, 5, 20 

d.  20, 5, 8, 12 

Question number: 39
» Mental Ability » Basic Arithmetic
Question
Ifis factor of , find the value of a.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 40
» Mental Ability » Basic Arithmetic
Question
The bacteria in a culture grows by 7 % in the first hour, decreases by 6 % in the second hour and again increases by 5 % in the third hour. If at the end of the third hour the count of bacteria is 11270000. The original count of bacteria in the sample is________
Choices
Choice (4)  Response  

a. 


b. 


c.  11270000 

d.  None of the above 

Question number: 41
» Mental Ability » Basic Arithmetic
Question
The sum of two angles of a triangles is 120° and their difference is 20°, find all the angles of the triangle.
Choices
Choice (4)  Response  

a.  40°, 50°, 90° 

b.  60°, 58°, 70° 

c.  50°, 40°, 90° 

d.  70°, 50°, 60° 

Question number: 42
» Mental Ability » Basic Arithmetic
Question
How many liters of 30 % alcohol solution should be added to 50 liters of a 60 % alcohol solution to make a 40 % solution?
Choices
Choice (4)  Response  

a.  100 liters 

b.  80 liters 

c.  40 liters 

d.  60 liters 
