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In a row of 48 students facing North, Tinu is 15th from the left end. If Dinesh is 9th to the right of Tinu, what is Dinesh's position from the right end of the line?
25th
23rd
22nd
24th
25th
To find the position from the right end, use the formula: Position from Right = Total Students - Position from Left + 1.
To find the position from the right end, use the formula: Position from Right = Total Students - Position from Left + 1.
Step 1: Find Dinesh's position from the left end
Tinu is 15th from the left end. Dinesh is 9th to the right of Tinu. Therefore, Dinesh's position from the left end is 15 + 9 = 24th.
Step 2: Apply the total rank formula
The formula to find the position from the right end when total students and position from the left are known is: Position from Right = Total Students - Position from Left + 1.
Step 3: Calculate the final position
Substituting the values: Position from Right = 48 - 24 + 1 = 24 + 1 = 25th.
B: 23rd is incorrect as it results from incorrect arithmetic or missing the +1 offset. C: 22nd is incorrect because 48 - 24 equals 24, and forgetting to add 1 gives 24, not 22. D: 24th is incorrect because it is Dinesh's position from the left end, not the right end.
A is correct because Dinesh's position from the left is 24th (15 + 9), and his position from the right is calculated as Total (48) - Left Position (24) + 1 = 25th.
Always remember to add 1 when converting between left-end and right-end positions in a linear row to account for double-counting the person's exact seat.
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