FORTUNE
Academy
for career and competitive exams
QUESTIONS ON
AVERAGE
Each of the following items has some suggested answers, out
of which only one is correct. Choose the correct answer. You can post your
doubts as comments or messages and will be cleared freely
1.
The average of five numbers is 8 and the average
of the last three numbers is 6.The
average of the first two numbers is
a.
11
b.
23
c.
13
d.
12
e.
none of these
2.
The average weight of A, B, and C is 45 kg. That
of A and B is 40 kg. That of B and C is 43 kg. What is the weight of B?
a.
25
b.
31
c.
18
d.
22
e.
none of these.
3.
Out of 32 students 8 are 1 m 15cm in height, 10
are 1 m 10 cm and the rest 1 m 14 cm. What is the average height of the
students?
a.
1m 21cm
b.
1 m 16 cm
c.
1 m 11 cm
d.
1 m 13 cm
e.
none of these
4.
The average temperature for 1st, 2nd
and 3rd June was 40⁰ C. The average for 2nd, 3rd
and 4th was 41⁰ C. The temperature on 4th was 42⁰
C. What was the temperature on 1st June?
a.
39⁰ C
b.
40⁰ C
c.
41⁰ C
d.
42⁰ C
e.
none of these
5.
The average of the first three numbers is double
of the fourth number. if the average of all the four numbers is 12, find the 4th
number.
a.
48/7
b.
38/9
c.
51/7
d.
53/9
e.
none of these
6.
The average age of a husband and wife who are
married 4 years ago was then 25 years. The average age of the family consisting
of husband, wife and a child now is 20 years. What is the age of the child?
a.
Less than one year
b.
2½ years
c.
1 year
d.
2 years
e.
none of these
7.
Out of 9 players, the player 16 years old leaves
the play ground. A new player is taken in his place. In this way the average
age is increased by 2 months. The age of the new player will be
a.
15 years 2 months
b.
18 years 9 months
c.
16 years 7 months
d.
17 years 6 months
e.
none of these
8.
A cyclist rides 24km at 16km per hour and
further 36 km at 15 km per hour. Find his average speed for the journey.
a.
16.38 km/hour
b.
15.38 km/hour
c.
16.50 km/hour
d.
none of these
9.
The population of six villages is
880,903,923,1145,850,1050. What is the population of the seventh village if the
average population of seven is 999?
a.
1298
b.
1281
c.
1242
d.
1100
e.
none of these
10.
Average age of a class consisting of 40 students
is 12 years. If the age of the teacher is also added, the average is increased
by one year. What is the age of the teacher?
a.
43 years
b.
41 years
c.
51 years
d.
53 years
e.
none of these
11.
The average rainfall of Delhi from Jan to June
was 5 cm. In July it was 26 cm and in August 40 cm. The average rainfall up to
August will be
a.
10 cm
b.
12 cm
c.
22 cm
d.
18 cm
e.
none of these
12.
The average marks obtained by a class of 30
students in a subject was 60. If the two best boys got 75 and 73 marks
respectively, what was the average of the rest of the boys in the class?
a.
59
b.
58.5
c.
58.2
d.
58
e.
none of these
13.
Of three numbers, the first is twice the second
and three times the third. The average of all the three numbers is 88. The
smallest number is
a.
46
b.
50
c.
72
d.
48
e.
none of these
14.
The average of three numbers is 7, and that of
the first two is 4. Find the third number.
a.
11
b.
12
c.
13
d.
14
e.
none of these
15.
A tree is 8.4 metres high, another is half its
height and the third one quarter its height. What is the average height of the
three?
a.
5.9 m
b.
4.9 m
c.
4.7 m
d.
5.7 m
e.
none of these
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