# Mathematics (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 26 - 31 of 224

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## Question number: 26

» Mathematics » Probability

MCQ▾

### 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

MCQ▾

### 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

MCQ▾

### 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

MCQ▾

### 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

MCQ▾

### 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

MCQ▾

### 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