Mental Ability (NCO Cyber Olympiad Class 6): Questions 17  22 of 394
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Question number: 17
» 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: 18
» 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: 19
» 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: 20
» 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 

Question number: 21
» Mental Ability » Ranking Test
Question
Which pair of numbers represents the greatest and the least numbers in the following set?
{0, 7, 2, 0.08, 1.69, 1.8}
Choices
Choice (4)  Response  

a.  {1.69, 0.08} 

b.  {2, 0.7} 

c.  {2, 0.08} 

d.  {1, 8, 2} 

Question number: 22
» Mental Ability » Basic Arithmetic
Question
Teachers were taking lectures. Each teacher’s lecture was 28 to 30 minutes long. Which of the following is the best estimate for the number of lectures that could be given in 3hours?
Choices
Choice (4)  Response  

a.  6 lectures 

b.  3 lectures 

c.  10 lectures 

d.  9 lectures 
