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The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases by 3 month. Find the age of the teacher.

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Important Questions on Averages

EASY

Numerical Ability>Arithmetic>Averages>Problems on Averages

The average of eleven numbers is

30

. If the average of the first ten numbers is

22

, then what is the eleventh number?

EASY

Numerical Ability>Arithmetic>Averages>Problems on Averages

The average height of the students in a class of

10

105

c m .

. If

20

more students with an average height of

120 c m

join the class, what will be the average height of all students

?

EASY

Numerical Ability>Arithmetic>Averages>Problems on Averages

45

is the average marks obtained by

30

students of a class. On checking, two errors were identified. On correction, one student obtained

45

more marks while other obtained

15

less marks. What is the average of corrected marks?

MEDIUM

Numerical Ability>Arithmetic>Averages>Problems on Averages

An object travels $20$ meters in $4$ seconds and $15$ meters in the next two seconds. What is the average speed of the object?

MEDIUM

Numerical Ability>Arithmetic>Averages>Problems on Averages

The average of

x

y

z

24

x : y

= 2 : 3

x + y = 60

, then find

x - z

MEDIUM

Numerical Ability>Arithmetic>Averages>Problems on Averages

Average of

8

numbers is

42

. If

9

is subtracted from each number then what will be the new average?

MEDIUM

Numerical Ability>Arithmetic>Averages>Problems on Averages

$35$ is the average marks obtained by $120$ students. The average marks of successful candidates was $39$ , and that of unsuccessful candidates was $15$ . What is the number of successful candidates in that examination?

MEDIUM

Numerical Ability>Arithmetic>Averages>Problems on Averages

The average of three numbers is

58

. First number is

\frac{3}{4} t h

of third number. If the third number is

24

more than the second number, what will be the difference between first and the second number?

EASY

Numerical Ability>Arithmetic>Averages>Problems on Averages

Average of three numbers $B, C$ and $D$ is $1$ more than the average of $A, B$ and $C$ . Average of $A$ and $D$ is $19.5$ .

Quantity $1$ : Find $A$ .

Quantity $2$ : $21$ .

MEDIUM

Numerical Ability>Arithmetic>Averages>Problems on Averages

The average runs of a cricketer in a tournament, in which he played

14

matches, were

47 .

His average runs in the first seven matches were

57

, and that in the last five matches were

44 .

If the runs made by him in

8^{t h}

match was

15,

how many run did he make in

9^{t h}

match?

HARD

Numerical Ability>Arithmetic>Averages>Problems on Averages

The average weight of

25

objects is

50 k g

. If the weight of another object X is added to it then the average weight increases by

500 g

. What is the weight of X?

MEDIUM

Numerical Ability>Arithmetic>Averages>Problems on Averages

A batsman played three matches in a tournament. The respective ratio between the scores of

1

^st and

2

^nd match was

5 : 4

and that between the scores of the

2

^nd and the

3

^rd match was

2 : 1

. The difference between the

1

^st and

3

^rd match was

48

runs. What was the batsman’s average score in all the three matches?

EASY

Numerical Ability>Arithmetic>Averages>Problems on Averages

The average of the scores of

18

boys in a test is

16

, while the average of the total

30

students in the class is

18.1

. What is the average score of the girls?

EASY

Numerical Ability>Arithmetic>Averages>Problems on Averages

Average height of a class of

12

students is

180

cm. The average decreases to

179

cm when the height of the class teacher is also added. What is the height of the teacher?

EASY

Numerical Ability>Arithmetic>Averages>Problems on Averages

Out of the five subjects, the average marks of Suman in the first

3

subjects were

81

and the average marks in the last

3

subjects were

74

. If her marks in the third subject were

65

, then what were her average marks in all the subjects?

EASY

Numerical Ability>Arithmetic>Averages>Problems on Averages

The average height of

A

B

and

C

148 c m

. If the average height of

A

and

B

136 c m

and that of

B

and

C

125 c m

, then what is the height (in cm.) of

B

MEDIUM

Numerical Ability>Arithmetic>Averages>Problems on Averages

Average of

8

numbers is

40

. The average of first three numbers is

46

and average of next two numbers is

50

. If the sixth number is

6

and

10

less than seventh and eighth number respectively, then what is the value of eighth number?

HARD

Numerical Ability>Arithmetic>Averages>Problems on Averages

The average weight of boys in a class is

30 k g

and the average weight of girls in the same class is

20 k g

. If, the average weight of whole class is

23.25 k g

, what could be the possible strength of boys and girls respectively in the same class?

EASY

Numerical Ability>Arithmetic>Averages>Problems on Averages

There are

5

consecutive odd numbers. If the difference between the square of the average of the first two odd numbers and the square of the average of the last two odd numbers is

588

, what is the smallest odd number?

EASY

Numerical Ability>Arithmetic>Averages>Problems on Averages

The average height of

16

students in a class is

142 cm

. If the height of the teacher is added the average increases by

1 cm

. What is the height of the teacher in

cm

The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases by 3 month. Find the age of the teacher.

Important Questions on Averages

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