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

Total Questions: 50

21. If x = y/2 and y = z/6, then x : y : z is equal to: [RRB NTPC 27/01/2021 (Morning)]

Correct Answer: (c) 1 : 2 : 12
Solution:

x : y = 1 : 2 ⇒ y : z = 1 : 6
x : y : z = 1 : 2 : 12

22. What must be subtracted from each of the numbers 23, 40, 57 and 108 so that the remainders are in proportion? [RRB NTPC 28/01/2021 (Morning)]

Correct Answer: (d) 6
Solution:

23. In an army camp, there were provisions for 425 men for 30 days. However, 375 men attended the camp. How long did the provision last? [RRB NTPC 28/01/2021 (Morning)]

Correct Answer: (c) 34 days
Solution:

24. A certain sum of money is divided among A, B and C. A gets one-third of the amount. B gets thrice as much as what C gets and C gets Rs. 1,200 less than what A gets. Find the share (in Rs.) of A. [RRB NTPC 30/01/2021 (Morning) ]

Correct Answer: (d) 2,400
Solution:

25. A bag contains Rs 3,000, the notes of which are in the denomination of Rs 50 , Rs 100 and Rs10. If the notes of Rs 100, Rs 50 and Rs 10 are in the ratio of 5 : 8 : 10 , then the numbers of the notes of Rs 50 in the bag will be ? [RRB NTPC 30/01/2021 (Evening) ]

Correct Answer: (c) 24
Solution:

The notes of Rs 100, Rs. 50 and Rs. 10 = 5 : 8 : 10
Rs 50 in the bag = 3000 × 8/1000 = 24

26. The speeds of three cars are in the ratio of 5 : 6 : 10. The time taken by each of them to travel the same distance is in the ratio of : [RRB NTPC 30/01/2021 (Evening) ]

Correct Answer: (d) 12 : 10 : 6
Solution:

The speeds of three cars are in the ratio = 5 : 6 : 10. Total distance = LCM of ( 5 , 6 ,10 ) = 30 So that , Ratio of the time
= 1/5 : 1/6 : 1/10 = 12 : 10 : 6

27. If A : B = 1 : 3 , B : C = 5 : 4 and C : D = 2 : 3, then the value of A : B : C : D will be : [RRB NTPC 31/01/2021 (Evening) ]

Correct Answer: (d) 5 : 15 : 12 : 18
Solution:

28. An amount of money is to be divided between A, B and C in the ratio 5 : 2 : 8. If the difference between the shares of A and C is Rs. 7,740, then what will be the total amount? [RRB NTPC 31/01/2021 (Evening)]

Correct Answer: (b) Rs. 38,700
Solution:

29. If the length and perimeter of a rectangle are in the ratio 3 : 20, then its length and breadth are in the ratio of: [RRB NTPC 31/01/2021 (Evening)]

Correct Answer: (a) 3 : 7
Solution:

30. Income and expenditure of a person are in the ratio of 9 : 5. If the income of the person is Rs. 27,000, then find his savings. [RRB NTPC 01/02/2021 (Morning)]

Correct Answer: (a) Rs. 12,000
Solution: