Practice test

Average - Test Set 1

Review 20 exam-focused questions with detailed explanations, then start the interactive test when you are ready.

20 questions

Questions and explanations

  1. Question 1

    The Average of 29.75, 18.25 and number N is 23. What is the value of number N?
    1. 23
    2. 19
    3. 17
    4. 21
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  2. Question 2

    The Average of two numbers id XY. If one number is X, the other is:
    1. Y2
    2. Y
    3. 2XY - X
    4. X(Y - 1)
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  3. Question 3

    Four numbers A, B, C and D are such that their overall Average is 16. The Average of C and D is:
    1. 21.5
    2. 22.5
    3. 25.5
    4. 23
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  4. Question 4

    To win a competition, Germilin needs an Average of 80 marks in four exams. His marks in the first three exams are 81, 77 and 73. How many marks should he score in the fourth exam to win the competition?
    1. 89
    2. 67
    3. 68
    4. 66
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  5. Question 5

    A grocer has a sale of Rs.6,435 , Rs.6,927 , Rs.6,855 , Rs.7,230 , and Rs.6,562 , for 5 consecutive months. How much sale must he have in the sixth month so that he gets an Average sale of Rs.6,500?
    1. Rs.4,991
    2. Rs.5,991
    3. Rs.6,001
    4. Rs.6,991
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  6. Question 6

    Find the Average of 45% of 70 and 35% of 110.
    1. 34.5
    2. 35
    3. 37.5
    4. 35.5
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  7. Question 7

    The mean of 20 observations is 22.5. One observation was mistakenly noted as -25 instead of 25. Find the correct mean.
    1. 21.75
    2. 25
    3. 20
    4. 32.75
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  8. Question 8

    The Average weight of 25 bags is 55 kg. The weight of one bag was misread as 65 instead 56. Find the correct mean.
    1. 54.64
    2. 55.36
    3. 55.25
    4. 55.65
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  9. Question 9

    The mean of marks obtained by 40 students is 68. Later, it was found that the number 25 has been misread as 45. Find the correct mean.
    1. 28
    2. 67.5
    3. 68.5
    4. 15
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  10. Question 10

    The average height of the 10 students in a class is 105cm. If 20 more students with an average height of 120cm join the class, what will be the new average height?
    1. 105 cm
    2. 110 cm
    3. 112 cm
    4. 115 cm
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  11. Question 11

    The mean of 6 numbers is 18. If one more number is included, the mean of the 7 numbers will be 20. What is the number that is included?
    1. 30
    2. 20
    3. 32
    4. 10
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  12. Question 12

    The average weight of the eleven players of a cricket team in the state is 100 kg. When the weight of the coach is also added, the average weight increase by 1 kg. What is the weight (in kg) of the coach?
    1. 116
    2. 110
    3. 114
    4. 112
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  13. Question 13

    The average weight of 107 notebooks kept in a box is 10.7 kg. By adding 1 more notebook in the box, its average weight becomes 10.8 kg. Find the weight of the new notebook?
    1. 21.5 kg
    2. 21.9 kg
    3. 21.3 kg
    4. 21.7 kg
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  14. Question 14

    The average of two numbers is 46. Together with a third number, the combined average of three numbers changes to 43. What is the third number?
    1. 40
    2. 35
    3. 37
    4. 38
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  15. Question 15

    The average age of 40 students a class is 15 years. When 10 new students are admitted, the average age is increased by 0.2 years. The average age of the new students is
    1. 15.2 years
    2. 16 years
    3. 16.2 years
    4. 16.4 years
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  16. Question 16

    The average of 7 numbers is 143. After cutting one number, the average remains the same. Find the excluded number.
    1. 143
    2. 139
    3. 141
    4. 137
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  17. Question 17

    The average of 6 numbers is 16. If one of the numbers is excluded, the average becomes 17. Find the excluded number.
    1. 12
    2. 10
    3. 11
    4. 13
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  18. Question 18

    The Average weight of 10 men is increased by 1.5 kg when one of the men whose weight is 68 kg is replace by a new man. Find the weight of the new man.
    1. 83 kg
    2. 82 kg
    3. 79 kg
    4. 73 kg
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  19. Question 19

    The Average weight of a group of 10 people increases by 1 kg when one of them weighing 58 kgs is replaced by a new person. The weight of the new person is -
    1. 68 kg
    2. 66 kg
    3. 64 kg
    4. 62 kg
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  20. Question 20

    The mean of 100 observations is 50. If observations 50 is replaced by 150, what will be the new mean?
    1. 50.5
    2. 49.5
    3. 51
    4. 52
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