Problems on Numbers - Aptitude Questions and Answers| Problems on Numbers questions and answers| Problems on Numbers aptitude questions and answers| Aptitude questions and answers in Problems on Numbers| aptitude Problems on Numbers formulas| Problems on Numbers aptitude questions and answers for interview |Page 1 Infibee

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Important Formulas
Problems on Numbers

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General Aptitude
Problems on Numbers

On dividing a number by 4, the sum of quotient and remainder is 8 and sum of their squares is 34. Find the number.

A.
24
C.
23

B.
22
D.
25

Answer & Explanation
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Answer : [C]
Explanation :

Let the quotient be Q and remainder = R

Given, number = 4Q + R

Q + R = 8

------------ (1)

Q² + R² = 34

------------ (2)

(Q + R)² = Q² + R² = 2QR

8² = 34 + 2QR

QR =

64 - 34

= 15

(Q � R)² = Q² �+ R² � 2QR = 34 � 30 = 4

Q - R = 2

------------ (3)

Adding (1) and (3) 2Q = 10

Q = 5

R = 8 - Q = 8 - 5 = 3

The number = 4Q + R = (4 x 5) + 3 = 20 + 3 = 23

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In a forest, there are some rabbits and pigeons. They have 20 heads and 48 feet. How many pigeons are there?

A.
8
C.
6

B.
16
D.
4

Answer & Explanation
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Answer & Explanation : [B]
Explanation :

Let x be the no. of rabbits and y be the no. of pigeons.

Then, x + y = 20

................ (1)

4x + 2y = 48

................ (2)

Solving (1) and (2) we get x = 4, y = 16

No. of. Pigeons = 16.

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The sum of three numbers is 60. If the ratio between first and second is 1 : 2 and that between second and third is 2 : 3 then the second number is

A.
30
C.
15

B.
10
D.
20

Answer & Explanation
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Answer : [D]
Explanation :

A : B = 1 : 2

and

B : C = 2 : 3

A : B : C = 1 : 2 : 3

Second number =

x 60 = 20

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The difference between the numerator and denominator of a fraction is 5. If 5 is added to its

denominator the fraction is decreased by 1

. Find the value of the fraction

A.
1

6
B.
3

1

4

B.
2

1

4

D.
6

Answer & Explanation
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Answer : [B]
Explanation :

Let the denominator of the fraction be = x

Then, numerator = x + 5

x + 5

+ 1

x + 5

= 2

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Name

When a teacher distributed craft papers to students in her class each one got 7 papers, and 14 papers remained with the teacher. If two more students would have been in the class, no paper would have remained undistributed. How many students, the teacher had in her class?

A.
70
C.
52

B.
58
D.
Data inadequate

Answer & Explanation
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Answer : [D]
Explanation :

Either the total no. of craft papers should be given or in the second case the no. of papers got by each student should be given.

Data inadequate.

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