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In a row of 38 students facing north, Sunil is 20 th from the left end. If Harsh is 10 th to the right of Sunil, what is Harsh's position from the right end of the row?
6 th
7 th
8 th
9 th
9 th
To find position from the opposite end: (Total students - Position from known end) + 1. For Harsh, first find his position from the left (20 + 10 = 30), then subtract from total and add 1.
To find position from the opposite end: (Total students - Position from known end) + 1. For Harsh, first find his position from the left (20 + 10 = 30), then subtract from total and add 1.
Find Harsh's position from the left
Sunil is at 20th position from the left. Harsh is 10 places to the right of Sunil, so Harsh's position from the left = 20 + 10 = 30th.
Calculate position from the right end
To find the rank from the opposite end, use the formula: Rank from Right = (Total Number of Students - Position from Left) + 1. Here, (38 - 30) + 1 = 8 + 1 = 9th.
A: 6th is incorrect as it ignores the total count calculation, B: 7th results from incorrect arithmetic, C: 8th is the result of simply subtracting without adding 1 (forgetting the inclusion of the person themselves).
D is correct because Harsh is 30th from the left, and applying the rank formula (38-30+1) confirms his position is 9th from the right end.
In ranking questions, always remember that 'Rank from Right + Rank from Left = Total + 1'. This is the most reliable way to verify your seat counting!
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