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

Total Questions: 50

31. The compound ratio of 1 : 2, 3 : 10 and 10 : 21 is: [RRB NTPC 05/04/2021 (Morning)]

Correct Answer: (d) 1 : 14
Solution:

32. The ratio of the incomes of two persons is 7 : 5 and that of their respective expenditures is 9 : 7. Find the respective income of each person if they save Rs. 1,700 and Rs. 1,100 respectively. [RRB NTPC 05/04/2021 (Evening)]

Correct Answer: (d) Rs. 3,500, Rs. 2,500
Solution:

33. If a : b = c : d = e : f = g : h = 1 : 3, then what will be the value of the following: (pa + qc + re + sg) : (pb + qd + rf + sh) [RRB NTPC 05/04/2021 (Evening)]

Correct Answer: (c) 1 : 3
Solution:

34. If a : b = 2 : 5 , b : c = 5 : 8 , c : d = 8 : 11 , then a : d is : [RRB NTPC 06/04/2021 (Morning) ]

Correct Answer: (c) 2 : 11
Solution:

given a : b = 2 : 5, b : c = 5 : 8, c : d = 8 : 11
Then a : b : c : d = 2 : 5 : 8 : 11
then a : d = 2 : 11

35. If among four numbers, the second is thrice of the first, the third is four times the second, the fourth is five times the third, and the mean of the four numbers is 1900, then the smallest number is : [RRB NTPC 06/04/2021 (Morning) ]

Correct Answer: (d) 100
Solution:

36. John and Joseph have Rs.19,000 and Rs.26,000 respectively with them. If Joseph gives Rs. 1,000 to John, then the ratio of the amount with John and that with Joseph is : [RRB NTPC 06/04/2021 (Evening) ]

Correct Answer: (d) 4 : 5
Solution:

Initially John have Rs 19,000 and Joseph have Rs 26,000 If Joseph gives Rs. 1,000 to John, Ratio of the amount with john and Joseph = 20000 : 25000 = 4 : 5

37. 65% of the first number is 130 and 40% of the second number is 100. The ratio of the first number to the second number is: [RRB NTPC 06/04/2021 (Evening)]

Correct Answer: (c) 4 : 5
Solution:

38. The ratio of the sum of money Arun and Ahaan had is 9 : 5. If Arun gives Rs.12 from his share to Ahaan, then the ratio will change to 4 : 3. How much money did Arun have initially? [RRB NTPC 07/04/2021 (Evening)]

Correct Answer: (c) Rs. 108
Solution:

39. 3/5 of a number is 10 more than 1/2 of the second number. If 8 is subtracted from 3/7 of the first number, then it becomes 4 less than 1/2 of the second number. What is the sum of the two numbers? [RRB NTPC 08/04/2021 (Evening)]

Correct Answer: (d) 57
Solution:

40. The difference between two numbers which are in the ratio 5 : 3 is 50. What is the product of the numbers ? [RRB NTPC 08/04/2021 (Evening) ]

Correct Answer: (a) 9375
Solution:

Let , numbers are 5x and 3x Difference between them = 2x = 50
So, x = 25
Numbers = 125 and 75 Hence product of the numbers
= 125 × 75 = 9375