Mental AbilityBasic Arithmetic (NCO Cyber Olympiad Class 9): Questions 8  13 of 49
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Question number: 8
» 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 

Question number: 9
» Mental Ability » Basic Arithmetic
Question
The ratio of the ages of Mayuri and Mayur is 4: 3. The sum of their ages is 28 years. The ratio of their ages after 8 years will be:
Choices
Choice (4)  Response  

a.  6: 5 

b.  12: 17 

c.  4: 7 

d.  7: 4 

Question number: 10
» Mental Ability » Basic Arithmetic
Question
In a family, the father took of the cake and he had 3 times as much as each of the other members had. The total number of family member is ________
Choices
Choice (4)  Response  

a.  3 

b.  10 

c.  7 

d.  12 

Question number: 11
» Mental Ability » Basic Arithmetic
Question
Only if
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 12
» Mental Ability » Basic Arithmetic
Question
When simplified is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 13
» Mental Ability » Basic Arithmetic
Question
A car travels 120 km from A to B at 30 km per hour but returns the same distance at 40 km per hour. The average speed for the round trip is closest to
Choices
Choice (4)  Response  

a.  36km/hr 

b.  33 km/hr 

c.  35km/hr 

d.  34km/hr 
