Mental AbilityBasic Arithmetic (NCO Cyber Olympiad (SOF) Class 9): Questions 35  40 of 49
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Question number: 35
» Mental Ability » Basic Arithmetic
Question
The bacteria in a culture grows by 20 % in the first hour, decreases by 10 % in the second hour and again increases by 20 % in the third hour. If at the end of the third hour the count of bacteria is 100000. The original count of bacteria in the sample is________
Choices
Choice (4)  Response  

a.  129300 

b.  129000 

c.  129900 

d.  129600 

Question number: 36
» Mental Ability » Basic Arithmetic
Question
Sterling gold is 92.5 % pure gold. How many grams of sterling gold must be mixed to a 90 % gold alloy to obtain a 500 gm of a 91 % gold alloy?
Choices
Choice (4)  Response  

a.  100 gm 

b.  50 gm 

c.  150 gm 

d.  200 gm 

Question number: 37
» Mental Ability » Basic Arithmetic
Question
Given, , and find the value of the following expression correct up to three places of decimal: .
Choices
Choice (4)  Response  

a.  17 

b.  12 

c.  10 

d.  30 

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 
