Скачать или смотреть Average Part-02 (13-30) -Dr. R.S. Aggarwal

#mathhelpline #mathhelpline 00:00 Quantitative Aptitude for Competitive Examinations
by S. Chand and Dr. R.S. Aggarwal
07. Average Part-01 (01-12)
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Part-01 (01-12) -    • Average  Part-01 (01-12)  -Dr. R.S. Aggarwal  



Part-02 (13-30) -    • Average  Part-02 (13-30)  -Dr. R.S. Aggarwal  



Part-03 (31-45) -    • Average  Part-03 (31-45)  -Dr. R.S. Aggarwal  



Part-04 (46-60) -   • Average  Part-04 (46-60)  -Dr. R.S. Aggarwal  


Part-05 (61-75) -   • Average  Part-05 (61-75)  -Dr. R.S. Aggarwal  



Part-06 (76-90) -   • Average  Part-06 (76-90)  -Dr. R.S. Aggarwal  



Part-07 (91-105) -   • Average  Part-07 (91-105)  -Dr. R.S. Aggarwal  



Part-08 (106-120) -   • Average  Part-08 (106-120)  -Dr. R.S. Agga...  



Part-09 (121-165) -   • Average  Part-09 (121-135)  -Dr. R.S. Agga...  


13. In Arun's opinion, his weight is greater than 65 kg but less than 72 kg. His brother does not agree with Arun and he thinks that Arun's weight is greater than 60 kg but less than 70 kg. His mother's view is that his weight cannot be greater than 68 kg. If all of them are correct in their estimation, what is the average of different probable weights of Arun?
a) 67 kg (b) 68 kg (c) 69 kg (d) Data inadequate (e) None of these

14. The average of 20 numbers is zero. Of them, at the most, how many may be greater than Zero
(a) 0 (b) 1 (c) 10 (d) 19

15. The mean of the first ten even natural numbers is
(a)9 (b) 10 (c)11 (d) 12

16. The arithmetic mean of first 11 natural numbers is
(a) 5 (b) 5.5 (c) 6.0 (d) 6.5

17. Find the average of all the numbers between 6 and 34, which are divisible by 5.
a) 18 (b) 20 (c) 24 (d) 30

18. The average of the first five multiples of 3 is
(a) 3 (b) 9 (c) 12 (d) 15

19. The average of the first nine prime numbers is
(a) 9 (b) 11 (c) 11/1/9 (d) 11/2/9

20. A student was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and x. He found the mean to be 12. What should be the number in place of x?
(a) 3 (b) 7 c) 17 (d) 31

21. The average of 2, 7, 6 and x is 5 and the average of 18, 1, 6, x and y is 10. whatis the value of y ?
(a) 5 (b) 10 c) 20 (d) 30

22. The total marks obtained by a student in Physics, chemistry and Mathematics together is 120 more than the marks obtained by him in chemistry. What is the average marks obtained by him in Physics and Mathematics together?
(a) 40 ) 120 (b) 60 (c)120 (d) Cannot be determined (e) None of these

23. The average of the first 100 positive integers is
(a) 49.5 (b) 50.5 (c)51 (d) 100

24. The average of odd numbers up to 100 is
(a) 49 (b) 49.5 (c) 51 (d) 100

25. In a family, the average age of a father and a mother is 35 years. The average age of father, mother and their only son is 27 years. What is the age of the son?
a) 10 years (b) 10.5 years c) 11 years (d) 12 years


26. The average of X1, X2, and X3, is 14. Twice the sum of X2 and X3, is 30. What is the value of X1
(a) 12 (b) 16 (c) 20 (d) 27

27. The average of X1, X2, x3and x4, is 16. Half the sum of x2, X3, X4, is 23. What is the value of X1? (a) ( a)17 (b) 18 (c) 19 (d) 20

28. If the mean of 5 observations x, x +2, x + 4, x + 6 and x+8 is 11, then the mean of the last three observations is
(a) 11 b) 13 (c) 15 (d) 17

29. If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of a2, b2,c2 is?
(a) M2 (b) 3M2 (c) 6M2 (d) 9M2

30. The average of the two-digit numbers, which remain the same when the digits interchange their positions, is
(a) 33 (b) 44 (c) 55 (d) 66