Tricks to Solve Ranking questions, Study Notes, Material - KVS (PRT & TGT)

 Note:

1. Read the statement carefully and draw the diagram.
2. Consider your Left Hand as the Left side and your Right Hand as the Right side.

Type 1:

Case1.

Total number of persons = (Sum of  the number of  the same person from both sides) – 1

Example: In a row of persons, the Position of Rahul from the left side of the row is 34^th and the position of Rahul from the right side is 37^th. Find the total number of persons in the row?

Sol:  Total no. of person= (Position of Rahul from left + Position of Rahul from right) – 1 =(34 + 37)-1= 71-1=70

Case 2.

The position of a person from another side= (Total number of persons- Position of the same person given side)+1

Example: In a row of 22 persons, the Position of  Rahul from the right side of the row is 13^th. Find the position of Rahul from the left side of the row?

Sol: Position of Rahul from left=(Total number of persons- Position of  Rahul from right side) +1 =(22-13)+1= 9+1= 10

Type 2:

When the positions of two persons are given from both ends and the total number of persons are also given and we have to find the number of persons between them-

There are two cases:-

Case 1: When there is no overlapping and we have to find the number of persons between them.

• of Persons between two different persons = Total no. of Persons – (Sum of positions of two different persons from both sides)

Example: In a row of 62 persons. Rahul is 24^th from the left side of the row and Nitesh is 20^thform the right side of the row. Find out the number of persons sitting between them?

Sol: No. of Persons between Rahul and Nitesh= 62-(24+20)=62-44=18

Case 2: When there is overlapping and we have to find the number of persons between them.

• of Persons between two different persons = (Sum of positions of two different persons from both sides) -Total no. of Persons –2

Example: In a row of 62 persons. Rahul is 36^th from the left side of the row and Nitesh is 29^thform the right side of the row. Find out the number of persons sitting between them?

Sol: No. of Persons between Rahul and Nitesh=(36+29)-62-2=65-62-2=1

Type 3:

If total no. of  Persons is to be asked and positions of different persons from any side are given then it is always a case of ‘cannot be determined’. Because we do not know if there will be overlapping or not.

Example: In a row Position of Rahul from the left side of the row is 22^nd  and position of Nitesh from the right side of the row is 35^th. Find the total no. of students in the row?

Solution: Cannot be determined

Type 4:

If positions are interchanged.

Example: Rahul and Nitesh are standing in a row of persons. Rahul is 12^th from the left side and Nitesh is 18^th from the right side of the row. If they interchanged their positions Rahul becomes 25^th from the left. Find these-

a) The new position of Nitesh from the right side

b) Total number of the person

c) Number of person between them

Sol: A) Rahul Position changes from 12^th to 25^th from the left end. So there is an increase of 13 ranks. Since Rahul and Nitesh both are interchanged their positions so there must be some increase in ranks. So new position of Nitesh from right side= 18 +13= 31

B) In these questions, Rahul position changes from 12 to 25 from left. That means 24 persons are standing from his left side. Now Rahul is at Nitesh’s position which is 18^th from the right side. That means 17 persons are standing from his right. Add all these left and right= 24+17+1(Rahul’s own)=42 total persons

C) of persons between Rahul & Nitesh = (Position of Rahul from left after interchanging– Position of Rahul from left before interchanging) – 1 ⇒ No. of persons between Rahul & Nitesh = (25 – 12) – 1 = 13 – 1 = 12

Type 5:

If positions of two persons are given and the third person is sitting exactly between them.

Example: In a row of persons, the position of Rahul from the left side of the row is 10^th and the position of Nitesh from the right side of the row is 9^th. If  Gaurav is sitting just in the middle of Rahul and Nitesh and the position of Gaurav from the left of the row is 16^th. Find the total number of persons in the row?

Sol: The position of Gaurav from left is 16^th and Rahul from left is 10^th so there are (16-10-1=5) persons are sitting between Rahul and Nitesh. As Gaurav is sitting exactly middle between them so 5 persons sitting between Gaurav and Nitesh. Position of Gaurav from right= Position of Nitesh from right 9 + 5 +1= 9+6=15^th 

Total number of persons= Sum of Gaurav’s positions from both sides -1 =(16+15)-1=31-1=30

Note: All the study notes are available in Hindi as well as the English language. Click on A/अ to change the language.

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