Ratio & Proportion (Railway Maths) (Part – VI)

Total Questions: 50

1. A tailor makes 6 pieces out of 1 m of cloth. If he has 33.5 m of cloth, then how many pieces can he make out of this cloth? [RRB NTPC 11/03/2021 (Evening)]

Correct Answer: (c) 201
Solution:

2. What is the mean proportional between 8 + 3√3 and 16 − 6√3? [RRB NTPC 12/03/2021 (Morning)]

Correct Answer: (c) √74
Solution:

3. If the cost of a car and a bike are in the ratio of 3 : 2 and the cost of the car is Rs. 15000 more than the bike, then find the cost (in Rs.) of the bike. [RRB NTPC 12/03/2021 (Evening)]

Correct Answer: (b) 30,000
Solution:

4. If x : y = 3 : 5, then the value of (5x − 3y) / (10x + 6y) is: [RRB NTPC 13/03/2021 (Morning)]

Correct Answer: (c) 0
Solution:

5. If a / b = 3 / 3 and b / c = 3 / 5, then the value of (a + b) / (b + c) is: [RRB NTPC 13/03/2021 (Morning)]

Correct Answer: (b) 15 / 16
Solution:

6. If a / b = 0.75, then the value of (2a + b) / (2a − b) + 4 / 9 is: [RRB NTPC 13/03/2021 (Morning)]

Correct Answer: (d) 49 / 9
Solution:

7. If a/b = b/c = c/d, then (b³ + c³ + d³) / (a³ + b³ + c³) will be equal to: [RRB NTPC 14/03/2021 (Morning)]

Correct Answer: (a) d/a
Solution:

8. If 2.5x = 0.05y, then (y − x) / (y + x) = ? [RRB NTPC 14/03/2021 (Morning)]

Correct Answer: (b) 49/51
Solution:

2.5x = 0.05y ⇒ x/y = 0.05/2.5 = 1/50
Now,
⇒ y - x / y + x = 50 - 1/ 50 + 1 = 49/51

9. 2 men and 3 women can earn Rs. 49 in 7 days. 3 men and 6 women can earn Rs. 96 in 8 days. In what time 1 man and 1 woman earn Rs. 27? [RRB NTPC 14/03/2021 (Morning)]

Correct Answer: (a) 9 days
Solution:

10. Rama packs 36 boxes in 1 h. Her sister needs 3 h to pack the same number. How much time will they together take to pack these 36 boxes? [RRB NTPC 14/03/2021 (Morning)]

Correct Answer: (d) 45 min
Solution: