Mental AbilityBasic Arithmetic (NCO Cyber Olympiad Class 6): Questions 9  15 of 268
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Question number: 9
» Mental Ability » Basic Arithmetic
Question
is equivalent to ________.
Choices
Choice (4)  Response  

a.  50% 

b.  60% 

c.  35% 

d.  45% 

Question number: 10
» Mental Ability » Basic Arithmetic
Question
Which set of numbers is the prime factorization of 126?
Choices
Choice (4)  Response  

a. 


b.  ( 

c.  (2 × 5 × 3 × 3) 

d. 


Question number: 11
» Mental Ability » Basic Arithmetic
Question
L. C. M. of 81 and 54 is ________.
Choices
Choice (4)  Response  

a.  81 

b.  162 

c.  54 

d.  27 

Question number: 12
» Mental Ability » Basic Arithmetic
Question
Find the prime number from given numbers.
Choices
Choice (4)  Response  

a.  27 

b.  69 

c.  23 

d.  39 

Question number: 13
» Mental Ability » Basic Arithmetic
Question
A basket contains 300 mangoes. 75 mangos were distributed among students. The percentage of mangoes left in the basket is ________.
Choices
Choice (4)  Response  

a.  75% 

b.  30% 

c.  25% 

d.  50% 

Question number: 14
» Mental Ability » Basic Arithmetic
Question
Harsh is learning mathematics, he has X number then he multiply the number by 7 and subtract 9 from the answer. Starting with X, how can he get his original number back?
Choices
Choice (4)  Response  

a.  Divide X by 7 and then add 9 to the result 

b.  Add 9 to X and then divide the resulting number by 7 

c.  Subtract 9 from answer and then multiply the result by 7 

d.  Multiply X by 9 and then subtract 7 from the result 

Question number: 15
» Mental Ability » Basic Arithmetic
Question
HCF of two numbers is ________.
Choices
Choice (4)  Response  

a.  The greatest number which divides each number exactly 

b.  The greatest number exactly divisible by each number 

c.  (The product of two numbers) their LCM 

d.  Both a. and c. are correct 
