Discussion
In a row of 32 boys, when Dhruv was shifted by five places towards the left, he became 7th from the left end. What was his earlier position from the right end?
Answer: D
Dhruv's earlier position from the right end was 21st. After moving 5 places to the left he is 7th from the left, so before moving he was 7 + 5 = 12th from the left. In a row of 32, the position from the right is 32 - 12 + 1 = 21. The other options, 20th, 22nd and 19th, come from miscounting the shift or from leaving out the +1 in the formula. The count from the left was 7 after the move, so before the move he was 5 places further right, at 12th from the left. In a row of 32 the position from the right is 32 minus 12 plus 1, which is 21. Stopping at 32 minus 12 = 20 forgets to count his own place.
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