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In a row of 40 students standing facing North, Rahul is 15th from the left end. What is his position from the right end?
25th
26th
24th
27th
26th
Use the formula: Total students = (Position from left + Position from right) - 1. Therefore, Position from right = Total - Position from left + 1.
Use the formula: Total students = (Position from left + Position from right) - 1. Therefore, Position from right = Total - Position from left + 1.
Identify Given Data
Total number of students (N) is 40. Rahul's position from the left (L) is 15.
Apply Ranking Formula
To find position from right (R), use the formula R = (N - L) + 1. Substituting the values: R = (40 - 15) + 1.
Calculate Result
40 - 15 = 25. Then, 25 + 1 = 26. Rahul is 26th from the right end.
A: 25th is incorrect as it neglects to add the student himself (+1). C: 24th is incorrect because it is the simple difference (40-15-1). D: 27th is incorrect as it adds the student twice or miscalculates the total.
B is correct because subtracting his left position from the total and adding 1 accounts for his own position in the row (40 - 15 + 1 = 26).
In ranking questions, always remember that the person's own position is counted twice if you simply subtract; hence, you must always add 1 to the final result.
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