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In a row of 30 students, Rohan is 12th from the left. If he is shifted 4 places to the right, what is his new position from the right end?
14th
15th
16th
17th
15th
To find the new position from the right: Calculate new position from left (Initial + shift), then use formula: Right position = (Total students - New left position + 1).
To find the new position from the right: Calculate new position from left (Initial + shift), then use formula: Right position = (Total students - New left position + 1).
Calculate new position from the left
Rohan is initially 12th from the left. Shifting him 4 places to the right moves him to 12 + 4 = 16th position from the left.
Calculate new position from the right
In a row of 30 students, using the formula Position from right = (Total - Position from left + 1), we get: 30 - 16 + 1 = 15th.
A: 14th is incorrect because it ignores the +1 shift logic; C: 16th is the position from the left, not the right; D: 17th is mathematically inconsistent with the total count.
B is correct because shifting Rohan 4 places to the right makes him 16th from the left, and 30 - 16 + 1 equals 15th from the right.
When calculating positions, always add 1 because the person himself is included in the count; forgetting this +1 is the most common error in ranking questions.
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