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# Numbers Questions

Home > Quantitative Aptitude > Numbers > General Questions
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The sum of two consecutive number is 87. Which is the larger number?

A42

B43

C44

D45

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

Explanation:

Solution:  Prime numbers between 30 and 50 are:-

31,37,41,43,47

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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

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

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

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

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

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

Explanation:

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

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A printer begins printing forms at 9.33 AM,at the rate of 66 forms per minute ,another printer begins at 9.50 AM ,printing 77 forms per minute .At what time will the two printers have printed the same number of forms?

A10:20 a.m.

B11:20 a.m.

C01:20 a.m.

D11:20 p.m.

Explanation:

66*60/t = 77 *60/t+17
6 t+102=7 t
t = 102 i.e 1 hr 42 min => 11:20 a.m.

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8 friends planned to go to hotel for dinner and to share the bill amount equally. If one of them have forget to bring the wallet, then what will be the extra amount contribute by each to pay the bill of Rs.1904 ?

ARs.38

BRs.34

CRs.28

DRs.54

Explanation:

Given that the bill amount = Rs.1904
Actual share of each = Rs.1904/8 = Rs.238
If one of 8 is left, then the sharing amount = Rs.1904/7 = Rs.272
Then the extra amount given by each = Rs.(272 - 238) = Rs.34.

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