ISSB - Pak Navy Officer Selection Mathematics Averages — Set 2

ISSB - Pak Navy Officer Selection Mathematics Averages — Set 2

1. Question 1

   Q1. Average of 10, 20, x is 18. x is:

   • A) 20
   • B) 24
   • C) 26
   • D) 28

   Answer: 24

   Explanation: Sum of three numbers is 54. 10 plus 20 plus x equals 54, so x is 24.

2. Question 2

   Q2. Average of first 4 even numbers:

   • A) 3
   • B) 4
   • C) 5
   • D) 6

   Answer: 5

   Explanation: 2, 4, 6, 8 sum to 20. Average is 5. Work each step carefully; ISSB math rewards accuracy under time pressure.

3. Question 3

   Q3. Average of 9, 11, 13, 15, 17:

   • A) 11
   • B) 13
   • C) 15
   • D) 17

   Answer: 13

   Explanation: Sum is 65 and count is 5. Average is 13. Work each step carefully; ISSB math rewards accuracy under time pressure.

4. Question 4

   Q4. Average of 2, 4, 6, 8, 10, 12:

   • A) 6
   • B) 7
   • C) 8
   • D) 9

   Answer: 7

   Explanation: Sum is 42 and count is 6. Average is 7. Work each step carefully; ISSB math rewards accuracy under time pressure.

5. Question 5

   Q5. Average of 4, 8, 12, 16?

   • A) 8
   • B) 9
   • C) 10
   • D) 12

   Answer: 10

   Explanation: Sum is 40 divided by 4 numbers gives average 10. Work each step carefully; ISSB math rewards accuracy under time pressure.

6. Question 6

   Q6. Average of 5 numbers is 12. Their sum?

   • A) 50
   • B) 55
   • C) 60
   • D) 65

   Answer: 60

   Explanation: Sum equals average times count so 12 times 5 is 60. Work each step carefully; ISSB math rewards accuracy under time pressure.

7. Question 7

   Q7. Average of first five even numbers?

   • A) 4
   • B) 5
   • C) 6
   • D) 8

   Answer: 6

   Explanation: Even numbers 2,4,6,8,10 average to 30/5 which is 6. Work each step carefully; ISSB math rewards accuracy under time pressure.

8. Question 8

   Q8. Mean of 7, 11, 15, 19?

   • A) 11
   • B) 12
   • C) 13
   • D) 14

   Answer: 13

   Explanation: Sum 52 divided by 4 equals 13. Work each step carefully; ISSB math rewards accuracy under time pressure.

9. Question 9

   Q9. Average age of 3 persons 20, 30, 40?

   • A) 25
   • B) 30
   • C) 35
   • D) 40

   Answer: 30

   Explanation: Sum 90 divided by 3 gives average 30. Work each step carefully; ISSB math rewards accuracy under time pressure.

10. Question 10

    Q10. Weighted average: 10 items avg 6 and 20 items avg 9?

    • A) 7
    • B) 8
    • C) 8.5
    • D) 9

    Answer: 8

    Explanation: Total sum 60 plus 180 divided by 30 items equals 8. Work each step carefully; ISSB math rewards accuracy under time pressure.

11. Question 11

    Q11. Average of 10, 20, 30?

    • A) 15
    • B) 20
    • C) 25
    • D) 30

    Answer: 20

    Explanation: Sum 60 divided by 3 equals average 20. Work each step carefully; ISSB math rewards accuracy under time pressure.

12. Question 12

    Q12. Average of 6 numbers is 15. Sum?

    • A) 75
    • B) 80
    • C) 90
    • D) 100

    Answer: 90

    Explanation: Sum equals average times count so 15 times 6 is 90. Work each step carefully; ISSB math rewards accuracy under time pressure.

13. Question 13

    Q13. Mean of 8, 12, 16, 20?

    • A) 12
    • B) 14
    • C) 15
    • D) 16

    Answer: 14

    Explanation: Sum 56 divided by 4 equals 14. Work each step carefully; ISSB math rewards accuracy under time pressure.

14. Question 14

    Q14. Average of 5 and 15?

    • A) 8
    • B) 10
    • C) 12
    • D) 20

    Answer: 10

    Explanation: Sum 20 divided by 2 equals 10. Work each step carefully; ISSB math rewards accuracy under time pressure.

15. Question 15

    Q15. Median of 3, 7, 9?

    • A) 3
    • B) 7
    • C) 8
    • D) 9

    Answer: 7

    Explanation: Middle value of ordered list is 7. Work each step carefully; ISSB math rewards accuracy under time pressure.

16. Question 16

    Q16. Average of 6, 10, 14, 18?

    • A) 11
    • B) 12
    • C) 13
    • D) 14

    Answer: 12

    Explanation: Sum is 48 divided by 4 numbers gives average 12. Work each step carefully; ISSB math rewards accuracy under time pressure.

17. Question 17

    Q17. Average of 15, 20, 25, 30, 35?

    • A) 23
    • B) 24
    • C) 25
    • D) 26

    Answer: 25

    Explanation: Sum is 125 divided by 5 gives average 25. Work each step carefully; ISSB math rewards accuracy under time pressure.

18. Question 18

    Q18. Mean of 12, 18, 24, 30, 36?

    • A) 22
    • B) 23
    • C) 24
    • D) 25

    Answer: 24

    Explanation: Sum 120 divided by 5 equals 24. Work each step carefully; ISSB math rewards accuracy under time pressure.

19. Question 19

    Q19. Weighted average: 5 items avg 10, 15 items avg 20?

    • A) 16
    • B) 17
    • C) 17.5
    • D) 18

    Answer: 17.5

    Explanation: Total sum 50 plus 300 divided by 20 items equals 17.5. Work each step carefully; ISSB math rewards accuracy under time pressure.

20. Question 20

    Q20. Average of 5, 10, 15, 20, 25, 30?

    • A) 15
    • B) 16
    • C) 17.5
    • D) 18

    Answer: 17.5

    Explanation: Sum 105 divided by 6 equals 17.5. Work each step carefully; ISSB math rewards accuracy under time pressure.