Mental Ability (NCO Cyber Olympiad (SOF) Class 9): Questions 13  19 of 219
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Question number: 13
» Mental Ability » Basic Arithmetic
Question
The bacteria in a culture grows by in the first hour, decreases by in the second hour and again increases by in the third hour. If at the end of the third hour the count of bacteria is 9000. The original count of bacteria in the sample is________
Choices
Choice (4)  Response  

a.  11458 

b.  11286 

c.  11784 

d.  11956 

Question number: 14
» Mental Ability » Basic Algebra
Question
The solution of the equations is
Choices
Choice (4)  Response  

a.  There is no solution 

b. 


c. 


d. 


Question number: 15
» Mental Ability » Basic Algebra
Question
When simplified and expressed with negative exponents, the expression is equal to
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 16
» Mental Ability » Basic Arithmetic
Question
A bike travels 70 km from Rajkot to Jamnagar at 14 km per hour but returns the same distance at 15 km per hour. The average speed for the round trip is closest to
Choices
Choice (4)  Response  

a.  13 km/hr 

b.  10km/hr 

c.  12km/hr 

d.  16km/hr 

Question number: 17
» Mental Ability » Basic Algebra
Question
, then equals
Choices
Choice (4)  Response  

a.  18 

b. 


c. 


d. 


Question number: 18
» Mental Ability » Basic Arithmetic
Question
Only if
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 19
» Mental Ability » Basic Arithmetic
Question
The bacteria in a culture grows by in the first hour, decreases by in the second hour and again increases by in the third hour. If at the end of the third hour the count of bacteria is 14000. The original count of bacteria in the sample is________
Choices
Choice (4)  Response  

a.  19199 

b.  20199 

c.  17199 

d.  18199 
