76. The average weight of 12 persons is 60 kg whereas the average weight of the remaining 18 persons is 55 kg. Find the average weight of all the persons together.
(a) 54 kg
(b) 55 kg
(c) 56 kg
(d) 57 kg
77. The average of 20 numbers is 15 and the average of 5 of them is 12. What is the average of the remaining numbers?
(a) 14
(b) 15
(c) 12
(d) 16
78. The average of 11 numbers is 12. The average of the first 6 numbers is 15 and that of the last 4 numbers is 8. Find the seventh number.
(a) 18
(b) 10
(c) 12
(d) 14
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79. The average of 20 numbers is 15. The average of the first 12 numbers is 18 and the average of the last 7 numbers is 11. Find the 13th number.
(a) 5
(b) 6
(c) 7
(d) 8
80. The average of 40 numbers is 35. The average of the first 25 numbers is 30 and that of the last 16 numbers is 42. What is the 25th number?
(a) 22
(b) 27
(c) 18
(d) 24
81. A cricketer has an average of 28 runs in 24 innings. How many runs must he score in the 25th inning to make his average 29 runs?
(a) 57
(b) 63
(c) 45
(d) 53
82. A cricketer has an average of 60 runs in 10 innings. How many runs must he score in the 11th inning to make his average 62 runs?
(a) 74 runs
(b) 88 runs
(c) 82 runs
(d)78 runs
83. A cricketer has played 10 innings. He scores 100 runs in
the 11th inning due to which his average gets increased by 5 runs. What is his average after the 11th inning?
(a)45 runs
(b) 50 runs
(c) 55 runs
(d) 40 runs
84. A batsman makes a score of 87 runs in the 17th inning and thus increases his average by 3 runs. Find his average after 17th inning.
(a) 36 runs
(b) 37 runs
(c) 33 runs
(d) 39 ruńs
85. Find the average of all the prime numbers between 60 and 80.
(a) 68.4
(b) 70.2
(c) 72.8
(d) 74.6
86 . Find the mean of the first ten even numbers..
[Sainik School 2016]
(d) 5.5
(a) 10
(b) 11
(c) 9
87. Find the average of first 9 prime numbers.
(a) 9.8
(b) 10.3
(c) 12.7
(d) 11.1
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88. If average of the following marks obtained by students of Class-V is 35. 26, 45, 37, 43, 49, 20, x, 22 and 30. Find unknown mark i.e. x.
[Sainik School 2014]
(a) 33
(b) 49
(c) 37
(d) 43
89. The ages of 5 children are 13, 15, 11, 9 and 8 years. respectively. Find their average age.
(a) 10.6 years
(c) 10.2 years
(b) 11.2 years
(d) 11.8 years
90. The average age of 5 boys is 13 years. One more boy joins them and the average age becomes 12 years. Find the age of the boy who joins last. [Sainik School 2014]
(a) 5 years
(b) 6 years
(c) 7 years
(d) 8 years
91. The marks obtained by a student in five examinations are 90, 92, 93, 95 and 90. Find his average marks. [Sainik School 2013]
(a) 91
(b) 92
(c) 93
(d) 94
92. The average age of a class of 40 students is 18 years. When a teacher joins them their average age becomes 19 years. Find the teacher's age.
[Sainik School 2013]
(a)57 years
(b) 61 years
(c) 53 years
(d) 59 years
93. If the average of 14, 17, 21, 24, 26 and x is 20, then find the value of x.
[Sainik School 2012]
(a) 16
(b) 17
(c) 18
(d) 19
94. Find the average of 12 numbers if the average of the first 8 numbers is 21 and the average of the last four numbers is 18. [Sainik School 2011]
(a) 19
(b) 19.5
(c) 20
(d) 20.5
95. A car travels 58 km in the first hour, 62 km in the second hour and 75 km in the third hour. Find the average speed of the car. [Sainik School 2009]
(a) 65 km/hr
(c) 64 km/hr
(b) 63 km/hr
(d) 67 km/hr
96. The average age of 25 students of a class is 13 years. Out
of them, the average age of 15 students is 18 years. Find
the average age of the remaining students.
(a) 4.5 years
(c) 5.5 years
(b) 5.2 years
(d) 5.7 years
97. The depth of a swimming pool at six different places is 344 cm. 275 cm, 192 cm, 147 cm, 233 cm and 300 cm. Find the average depth of the swimming pool. [Sainik School 2008]
(a) 236.5 cm
(c) 248.5 cm
(b) 242 cm
(d) 252 cm
98. The population of four towns is 35560, 30000, 27500 and 25600 respectively. What is the average population of the town?
[Sainik School 2006]
(a) 29665
(b) 28865
(c) 29225
(d) 28485
99. The average age of 3 sisters is 15 years. If the ages of two sisters are 12 years and 15 years, then the age of the third sister is. [Sainik School 2018]
(a) 21 years
(b) 17 years
(c) 18 years
(d) 16 years
100. What is the average of the first 15 counting numbers?
(a) 8
(b) 15
(c) 16
(d) 7.5
Answer- 76-d 77-d 78-b 79-c 80-a 81-d 82-c 83-b 84-d 85-b 86-b 87-d 88-d 89-b 90-c 91- b 92-d 93-c 94-c 95-a 96-c 97-c 98-a 99- c 100- a
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