Average (Railway Maths) (Part – II)

Total Questions: 50

1. The average of 30 numbers is 55. The average of the first 15 numbers is 51 and the average of the last 12 numbers is 56. What is the average of 68, 74 and the remaining 3 numbers? [Level 6 (09/05/2022) Shift 1]

Correct Answer: (a) 71
Solution:

2. Find the value of √2k + 11, where k is average of 16, 25, 13, 26 and 15. [Level 6 (09/05/2022) Shift 1]

Correct Answer: (c) 7
Solution:

3. The average of 25 numbers is 48.2. If the average of the first 10 numbers is 47 and the average of the last 12 numbers is 49, then find the average of 58, 69 and the remaining numbers. [Level 6 (09/05/2022) Shift 2]

Correct Answer: (b) 54.8
Solution:

4. A family spends Rs 4,600, Rs 5,600, Rs 4,800, Rs 3,800 and Rs 6,000 on groceries in the first 5 months of a year. How much should the family spend in the 6th month to make the 6 months average spending of the family on groceries to Rs 4,500? [Level 5 (12/06/2022) Shift 1]

Correct Answer: (a) 2,200
Solution:

5. Karisma has been spending ₹5,400 on the purchase of an item every year for the past three years. However, the price per unit of this item has fluctuated from year to year with the per unit price being ₹9 in the first year, ₹24 in the second year and ₹14.40 in the third year. What was the average per unit price that Karishma paid for this item in the three years ? [Level 5 (12/06/2022) Shift 2 ]

Correct Answer: (b) ₹13.50
Solution:

6. 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? [Level 5 (12/06/2022) Shift 2]

Correct Answer: (c) 37
Solution:

7. Sunidhi earned an average of ₹6,250 per month during the past 12 months. During the first 10 months her average earnings per month was ₹5,800. What was Sunidhi's average earnings per month during the last two months of the period? [Level 5 (12/06/2022) Shift 2]

Correct Answer: (a) ₹8,500
Solution:

8. The average of 38 numbers is 51. The average of the first 24 numbers is 45, and that of the last 5 numbers is 60. What is the average of the remaining numbers? [Level 3 (14/06/2022) Shift 2]

Correct Answer: (c) 62
Solution:

9. The average of five consecutive natural numbers is 12. What will be the average of the seven numbers if the next two natural numbers are also included? [Level 5 (15/06/2022) Shift 1]

Correct Answer: (b) 13
Solution:

10. A batsman scored 84 runs in his 12ᵗʰ innings, thereby improving his average score per innings by 4 runs. What is the average score per innings of the batsman after the 12th innings? [Level 5 (15/06/2022) Shift 1]

Correct Answer: (b) 40
Solution: