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Numbers Questions

Home > Quantitative Aptitude > Numbers > General Questions
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Choose the correct option.

The sum of odd numbers between 0 and 10 is:


A15

B20

C25

D30

E35

Answer: Option C

Explanation:

Formula for sum of numbers = n/2(a+l)
Here series is 1 3 5 7 9
a=1,n=5,l=9
So, 5/2(1+9)=25

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Which is the middle even number between 9 and 23?


A14

B16

C18

D20

Answer: Option B

Explanation:

9+x = 23-x 2x = 14
X = 7
Now 9+x = 16

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The sum of two consecutive number is 87. Which is the larger number?


A42

B43

C44

D45

Answer: Option C

Explanation:

Two consecutive number are x and (x+1)
so, x+(x+1) = 87 => 2x+1 = 87
=> 2x = 86
=> x = 43
so, larger number is x+1 = 43+1 = 44

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Number of prime numbers between 30 and 50 is


A5

B6

C7

D2

Answer: Option A

Explanation:

Solution:  Prime numbers between 30 and 50 are:-



31,37,41,43,47 



So 5 is the answer.

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How many members are there between 1 to 100 which are divisible by 9 and the sum of two digits is 9?


A13

B11

C7

D9

Answer: Option D

Explanation:

No. of digit whose sum is 9 i.e 18, 27, 36, 45, 54, 63, 72, 81, 90
Total=9

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How many number from 11 to 50 are there which are exactly divisible by 7 but not by 3?


A2

B4

C5

D6

Answer: Option C

Explanation:

n(n+1)/n
4(4+1)/4 = 5

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The sum of the digits of a two digit number is 8. If the digits are reversed the number is decreased by 54. Find the number.


A17

B71

C18

D81

Answer: Option B

Explanation:

x+y = 8 -----(1)
(10y+x) - (10x+y) = 54 => 9y-9x = 54
y-x = 6 -------(2)
By solving eq. (1) and (2)
y = 7 and x = 1

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The average of first 50 natural numbers is :


A12.25

B21.25

C25

D25.5

Answer: Option D

Explanation:

The sum of n natural numbers = (n(n+1))/2
Hence (50(51))/2 = 1275
So, average = 1275/50 = 25.5

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A company bought twice as many small envelopes as large envelopes. It used up 1/13 of the small envelopes and 5/6 of the large envelops. What fraction of the total number was left unused?


A57/234

B157/234

C231/234

DNone of these

Answer: Option B

Explanation:

Let small envelopes bought=2x
Large envelopes bought=x
Total No. of envelopes bought=x+2 x=3x
Small envelope unused=(12/13)*2 x=24 x/13
Large envelope unused=(1/6)=x/6
Total envelope unused=(24x / 13)+(x / 6)=157x / 78
Fraction of the total envelope unused=(157x / 78)/3
=> x=157/234

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4 thieves enter a bakery and stole bread one after the other. Each one took half of the total number of breads half a loaf. If 3 breads were remaining what is the total number of breads.


A48

B63

C80

D53

Answer: Option A

Explanation:

Lets assume total bread = x
x(1/2 + 1/4 + 1/8 + 1/16 )+3=x
Therefore x=48

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