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

Total Questions: 50

1. If (a + b) : (b + c) : (c + a) is 6 : 7 : 8 and also a + b + c = 14. Then what is the value of c? [NTPC CBT - I 10/01/2021 (Evening)]

Correct Answer: (a) 6
Solution:

2. Ajay, Sunil, Krishna and Sumit are good friends. They rent a house together at Rs 15,000 per month. Ajay lives in this house for only 15 days in a month. Krishna and Sumit are also working and they decide to jointly contribute Rs 10,000 as their share of the rent. Sunil lives in the house for the whole month. If Ajay and Sunil decide to contribute to the rent based on the number of days they live in the house, what would be the share of rent paid by Ajay, Sunil, Sumit and Krishna respectively? [NTPC CBT - I 11/01/2021 (Morning)]

Correct Answer: (b) 1/9 2/9 1/3 1/3
Solution:

3. If the ratio of the 11th term of an AP to its 18th term is 2 : 3, find the ratio of the sum of its first five terms to the sum of its first 10 terms. [NTPC CBT - I 12/01/2021 (Evening)]

Correct Answer: (d) 6 : 17
Solution:

4. If A is 80% more than B and B is 20% less than C , then what will be the value of A : B : C ? [NTPC CBT - I 18/01/2021 (Evening) ]

Correct Answer: (a) 36 : 20 : 25
Solution:

5. 13/18 of the residents of a housing society own cars and 48/65 of the car owners have purchased covered parking space. If 136 of the residents parked in the open, how many residents were there in the society ? [NTPC CBT - I 31/01/2021 (Morning) ]

Correct Answer: (b) 720
Solution:

6. In a carton containing a dozen mirrors is dropped, which of the following can be the ratio of number of broken mirrors to unbroken mirrors? [NTPC CBT - I 09/02/2021 (Morning)]

Correct Answer: (d) 5 : 1
Solution:

1 dozen = 12 article
Only option (d) is possible because the sum option (5 : 1) is equal to 12.

7. Which of these sets of numbers are in continued proportion? [RRB JE 02/06/2019 (Afternoon)]

(i) 0.4, 3.6, 3.24
(ii) 7, 21, 63
(iii) 2.4, 9.6, 38.4

Correct Answer: (c) (ii) and (iii)
Solution:

8. In a bag, the ratio of red balls to green balls is 4 : 9. If 7 more red balls are added to the bag, the ratio of red balls to green balls will become 5 : 6. How many green balls are there in the bag? [ALP Tier - I 14/08/2018 (Evening)]

Correct Answer: (d) 18
Solution:

9. Pen, Pencil, and Eraser in a box are in the ratio 3 : 2 : 1. If the prices of pen, pencil and eraser are 3 Rs, 2 Rs and 2 Rs respectively, and if the cost of the box is 90 Rs, then find the number of pens in the box. [RPF Constable 17/01/2019 (Morning)]

Correct Answer: (d) 18
Solution:

10. Aamir distributed 875 gifts among 4 children. The part of the first child is twice the portion of the other child, three times the size of the third child, and four times the fourth child's share. Show the sum of the total gifts received by the first and the second child. [RPF S.I. 05/01/2019 (Morning)]

Correct Answer: (b) 630
Solution: