Twenty girls are sitting in a row. A girl is shifted by four places towards the left, then she became 8th from the left end. The earlier position of that girl from the right end of the row is
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Position from right = Total − Position from left + 1.
Concept:
Position change in a row using left–right conversion.
Explanation:
After shifting 4 places left, position = 8th from left.
So earlier position from left:
\[
8 + 4 = 12^{th}
\]
Total girls = 20
Position from right:
\[
20 - 12 + 1 = 9^{th}
\]