Mathematics (NTSE Stage1 (StateLevel) ScholasticAptitude & Language Comprehension): Questions 26  31 of 224
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Question number: 26
» Mathematics » Probability
Question
What is the probability of getting at least one head when two coins are tossed simultaneously?
Choices
Choice (4)  Response  

a.  0.5 

b.  0.66 

c.  0.75 

d.  0.25 

Question number: 27
» Mathematics » Statistics
Question
If the geometric mean of three observations 40, 50 and x is 10, then the value of x is
Choices
Choice (4)  Response  

a.  4 

b.  2 

c.  0.5 

d.  6 

Question number: 28
» Mathematics » Percentage
Question
3 L of water is added to 5 L of a 20 % solution of alcohol in the water. The strength of the alcohol is now
Choices
Choice (4)  Response  

a.  27.5% 

b.  12.5% 

c.  20% 

d.  28.5% 

Question number: 29
» Mathematics » Rational Numbers
Question
Ravi can build a wall in the same time in which Mahesh and Suresh together do it. If Ravi and Mahesh together could do it in 10 days and Suresh alone in 15 days. In what time Mahesh alone do it?
Choices
Choice (4)  Response  

a.  30 days 

b.  50 days 

c.  40 days 

d.  60 days 

Question number: 30
» Mathematics » Basic Geometry
Question
If one of the interior angles of a regular polygon is found to be times of one of the interior angles of a regular hexagon, then the number of sides of the polygon is
Choices
Choice (4)  Response  

a.  8 

b.  14 

c.  12 

d.  10 

Question number: 31
» Mathematics » Percentage
Question
A dealer buys an article listed at Rs. 100 and gets two successive discounts of 10 % and 20%. He spends 10 % of the cost price on transport etc. At what price should he sell the article to earn a profit of 15%?
Choices
Choice (4)  Response  

a.  Rs. 91.10 

b.  Rs. 91.08 

c.  Rs. 90 

d.  Rs. 91 
