Order and Ranking– Railway Reasoning (Part-I)

Total Questions: 50

21. In a class of 36 students, the number of boys is twice the number of girls. In the class, there are 13 boys before Reena whose position is 19th in the class. How many girls are there in the class after Reena? [NTPC CBT - I 30/12/2020 (Evening)]

Correct Answer: (a) 6
Solution:

As there are 36 students and ratio of boys : girls = 2:1
⇒ Number of boys = 24 & Number of
girls = 12
As Reena’s position is 19 th ,
⇒ There will be 18 students before Reena
and 17 students after Reena.
As there are 13 boys before Reena, also there will be 5 girls before Reena.
Now, the remaining 11 boys will be after Reena and there will be 6 girls after Reena
So, there are 6 girls after Reena in the class.

22. In a row of students, one student is tenth from either end of the row. How many students are there in the row? [NTPC CBT - I 05/01/2021 (Morning)]

Correct Answer: (c) 19
Solution:

In a row of students, one student is tenth from either end of the row.
So, from the above diagram, we can say that there are (9 + 1 + 9) = 19 students in the row.

23. Ram is elder than Shyam and Shyam is younger than Abhijeet. Abhijeet celebrates his 18th birthday today. Abhijeet is younger than Sanjeev. Sanjeev, Ram and Shyam are brothers and Ram is the eldest among them. Which one of the brothers is NOT yet legally an adult? [NTPC CBT - I 11/01/2021 (Morning)]

Correct Answer: (d) Shyam
Solution:

Ram > Sanjeev > Abhijeet > Shyam
Abhijeet celebrates his 18th birthday, which means that Shyam's

24. There are five girls in a group. K is the second tallest. P is taller than M. R is taller than M. N is taller than P. Which of the following sequences about their height is not possible? [NTPC CBT - I 12/01/2021 (Morning)]

Correct Answer: (d) R > K > P > N > M
Solution:

R > K > P > N > M

25. Five friends Ram, Shiv, Sunil, Ravi and Rohan are in a tuition batch. Ram is older than Rohan. Ravi and Shiv are older than Sunil, whose age is between Ram and Ravi. If all of them are arranged in the ascending order of their ages, then who will come in the middle? [NTPC CBT-1 17/01/2021 (Morning)]

Correct Answer: (d) Sunil
Solution:

The order of their ages is as follows:
Shiv > Ravi > Sunil > Ram > Rohan
From the above arrangement, we can see that Sunil comes in the middl

26. Fifteen houses are located in a row such that the distance between two adjacent houses is equal. If the distance between the 1st and 15th house is 560 ft., then what is the distance between the 3rd and 7th house? [NTPC CBT - I 25/01/2021 (Morning)]

Correct Answer: (c) 160 ft.
Solution:

Let the distance between two adjacent houses = X
Distance between the 1st and 15th house = 14X
Now, 14X = 560 ft ⇒ X = 40 ft
Distance between the 3rd and the 7th house = 4X = 4 40 = 160 ft.

27. Read the given information and answer the questions that follow. Six students A, B, C, D, E and F appeared in several tests. Either C or F scored the highest. Whenever C scored the highest, E scored the least. Whenever F scored the highest, B scored the least. In all the tests they got different marks. D scored higher than A but they were close competitors. A scored higher than B. C scored higher than A. E and F were close competitors. If C got the first rank, what was the rank of A? [NTPC CBT - I 01/02/2021 (Evening)]

Correct Answer: (a) Third
Solution:

Ranks of six students are as follows:
From the above table, we can see that A got the 3rd rank

28. There are 35 street lamps in a row on a national highway. All are lit except one. The faulty lamp is 15th from the right end. What is the position of the faulty lamp from the left end? [NTPC CBT - I 02/02/2021 (Morning) ]

Correct Answer: (c) 21st
Solution:

position of the faulty lamp from the left end = 35 - 15 + 1 = 21st

29. Seven students A, B, C, D, E, F, and H give a test. No two students get the same marks.A gets more marks than B. H gets more marks than A.Only two students get more marks than C. D gets more marks than C and B. But D does not get the highest marks. [NTPC CBT - I 03/02/2021 (Morning)]

If B did not get the lowest marks, then which of the following sequence of their marks is possible?

Correct Answer: (c) H>D>C>E>A>B>F
Solution:

H > D > C > E > A > B > F

30. A boy told his sister, " I have sisters twice the number of brothers. "The sister commented, "I have the same number of brothers and sisters. What is the number of girls in the family? [NTPC CBT-1 05/02/2021 (Morning)]

Correct Answer: (b) 4
Solution:

When boy told his sister, “ I have sisters twice the number of
brothers “ means ratio between brother and sister = x : 2x
“The sister commented, “ I have the same number of brothers and sisters
means = ( x + 1 ) = (2x - 1) x = 2 ⇒
Now , Number of girls in the family = 2x= 4