Average (Railway Maths) (Part – I)

Total Questions: 50

1. The average of 11 numbers arranged in an order is 41. The average of the first five numbers is 18 and that of the last five numbers is 64. What is the sixth number? [Group D 17/08/2022 (Morning)]

Correct Answer: (d) 41
Solution:

2. A group of people contains men, women and children. If 40% of them are men, 35% are women and the rest are children and their average weights are 70 kg, 60 kg and 30 kg, respectively. The average weight of the group is: [Group D 18/08/2022 (Evening)]

Correct Answer: (c) 56.5 kg
Solution:

3. In Munnar, a travel company has three 4-seater cars and two 8-seater maxi cabs. The rate of each passenger for a round trip in a car is Rs.25 and for a round trip in a maxi cab is Rs.20. The average occupancy of the seats is 100%. What is the average earning of each vehicle for one round trip? [Group D 25/08/2022 (Afternoon)]

Correct Answer: (c) Rs.124
Solution:

4. Find the answer of given question? [Group D 01/09/2022 (Afternoon) ]

Correct Answer: (d) 43,575
Solution:

5. The average of 10 observations is 46. It was realised later that an observation was misread as 42 in place of 142. Find the correct average. [Group D 08/09/2022 (Afternoon) ]

Correct Answer: (d) 56
Solution:

6. Find the answer of given question? [Group D 09/09/2022 (Afternoon) ]

Correct Answer: (a) 48
Solution:

7. Vishnu scored X runs in his 10ᵗʰ innings. After scoring those runs, his average per innings increased by 8 runs. If the new average is 28, then find the value of X. [Group D 06/10/2022 (Morning)]

Correct Answer: (d) 100
Solution:

8. Renu’s marks were wrongly entered as 99 in place of 9. Due to this error, the average marks of the class were 2.25 more than the actual average. What is the number of students in the class? [NTPC CBT II Level 6 (09/05/2022) Shift 2]

Correct Answer: (a) 40
Solution:

9. The average of 25 numbers is 55. The average of first 11 numbers is 51 and the average of the last 10 numbers is 56. What is the average of 66, 70 and the remaining 4 numbers out of given 25 numbers? [NTPC CBT II Level 5 (15/06/2022) Shift 2]

Correct Answer: (b) 65
Solution:

10. The average spending of a Family per week during a four-week period on essential items was Rs 1475 . During the first three weeks the family spent Rs 1200, Rs 1500, and Rs 1875 on such items. How much did the family spend on these items in the final week to ensure that the weekly average is maintained? [NTPC CBT II Level 5 (15/06/2022) Shift 3 ]

Correct Answer: (a) 1325
Solution: