Average (Railway Maths) (Part – II)

Total Questions: 50

11. Find the average of 45% of 70 and 35% of 110. [Level 5 (15/06/2022) Shift 2 ]

Correct Answer: (b) 35
Solution:

12. Consider a sequence of seven consecutive numbers. If the average of the first five numbers is ‘z’ , then find the average of the last three numbers. [Level 2 (16/06/2022) Shift 2 ]

Correct Answer: (d) z + 3
Solution:

13. Team India scored runs in the first 30 overs in an ODI match at an average of 5.6 runs per over. What is the required runs per over in the remaining 20 overs at which the team has to score to meet a total target of 320? [Level 3 (17/06/2022) Shift 2 ]

Correct Answer: (c) 7.6 runs per over
Solution:

14. Out of 60 students in a group, the ratio of the number of boys to that of girls is 2 : 1. If the average weight of boys is 50 kg and that of girls is 44 kg, then what is the average weight (in kg) of all the students in the group? [Level 3 (17/06/2022) Shift 2 ]

Correct Answer: (d) 48
Solution:

15. In a school the average age of boys and girls together is 16.8 years. The average age of boys is 15.4 years, and the average age of girls is 18.2 years. The ratio of number of boys to girls in the school is: [RRB NTPC 28/12/2020 (Evening)]

Correct Answer: (b) 1 : 1
Solution:

16. Out of three numbers, the first number is twice of the second and thrice of the third number. If the average of the three numbers is 880, what is the smallest number? [RRB NTPC 30/12/2020 (Evening)]

Correct Answer: (a) 480
Solution:

17. The average weight of P, Q and R is 58 kg. If the average weight of P and Q is 54 kg and that of Q and R is 48 kg, then the weight of Q is: [RRB NTPC 04/01/2021 (Evening)]

Correct Answer: (c) 30 kg
Solution:

18. The captain of a cricket team of 11 members is 35 years old and the wicket keeper is 5 years older than the captain. If the ages of these two are excluded, the average age of the remaining players is three years less than the average age of the whole team. What is the average age of the whole team? [RRB NTPC 04/01/2021 (Evening)]

Correct Answer: (a) 24 years
Solution:

19. At present the average age of 20 students of class ten is 15.5 years. The present age of the class teacher is 47 years. What will be the average age of the students and the class teacher after 5 years? [RRB NTPC 08/01/2021 (Morning) ]

Correct Answer: (a) 22 years
Solution:

20. The average weight of A, B, C and D is 56 kg. If the average weight of A, B and C is 52 kg and that of C and D is 48 kg. Then the weight of C is? [RRB NTPC 08/01/2021 (Evening) ]

Correct Answer: (c) 28 kg
Solution: