Students are usually frequented with the problems based on persons standing in a row or sitting on a bench. Some questions are based on the relative age / height or weight etc.
Ex 1: There are 12 persons in a row. The position of Vipul is 7th from left. What is his position from the right end?
Ans. There are total of 12 persons in the row and the position of Vipul is 7th from left. So there are 5 more persons after him. It means his position is 6th from the right end.
Ex 2: The position of Ram is 11th from right in a row of 50 persons. What is his position from the left end?
Ans. There are total of 50 persons in the row and the position of Ram is 11th from right. So there are more 39 persons ahead of him. It means his position is 40th from the left end.
50 + 1 – 11 = 40
Ex 3: Rohit is standing in a row. His position from the top is 7th and his position from the bottom is 10th. How many persons are there in the row?
Sol.: Position of Rohit from both sides is provided to us. To find out the number of persons in the row, we add up both the positions and reduce the final figure by one.
From the above diagram, we observe that there are six persons ahead of Rohit and nine persons are below him in the row. So the total number of persons in the row is 6 + Rohit + 9 = 6 + 1+ 9 = 16.
Ex 4: In a row, the position of Vivek is 12th from left in a row. Sham is 16 positions from right. Ishant is ahead of Vivek by three positions and between Ishant and Sham, there are 5 persons between them. What are the total number of persons in the row?
Ans. Position of Vivek = 12th from left , Position of Sham = 16th from right, Position of Ishant from Vivek = 3 Persons in between Ishant and Sham =5, Total number of persons = 12 + 16 + 3 + 5 = 36,
Ex 5: Khushi is 24th from left in a row and Sharvan is 27th from right. The total number of persons in the row is 62. Laksh is in the centre of Khushi and Sharvan. What is the position of Laksh from left? Find out his position from right as well.
Ans. Number of persons in between Khushi and Sharvan = 62 – (24 + 27) = 11Now Laksh is in between the two, so his position is 6th from either side.So position of Laksh from left = 24 + 6 = 30thAnd position of Laksh from right = 27 + 6 = 33rd
Step – 1: We make use of symbols =, >, < i.e. symbol of equality & inequality to find out the relative position
Step – 2: We arrange all the given elements in a single row relative to each other.
Step – 3: After the complete arrangement we can answer the question.
Solution: In these type of questions, we use the symbol > or < to make out, who is taller, bigger or elder. Steps to solve the questions:
Ex 6: Jasmine is taller than Megha and Megha is taller than Riya. Who is the tallest?
. Jasmine > Megha > Riya, so Jasmine is the tallest among the three.
Ex 7: Hemant is taller than Sameer. Sameer is shorter than Rayan. Rayan is shorter than Hemant. Who is the shortest?
Ans. Hemant > Sameer , Sameer < Rayan (or Rayan > Sameer) Rayan < Hemant (or Hemant > Rayan) So Hemant > Rayan > Sameer Hemant is the tallest and Sameer is shortest. So our answer is Sameer.