In a row of 40 students, Sheela is 5th from the right of Saurabh, who is 18th from the right end. Then find the rank of Sheela from the left end.
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When calculating ranks from the left or right end in a row, use the total number of elements and subtract the position from the opposite end to get the position from the desired end.
To solve this, we first find Saurabh's position from the left end.
Since Saurabh is 18th from the right end and there are 40 students in total, his position from the left end is:
\[
40 - 18 + 1 = 23.
\]
Sheela is 5th to the right of Saurabh, so Sheela's position from the left is:
\[
23 + 5 - 1 = 26.
\]
Thus, Sheela's rank from the left end is 26. Therefore, the correct answer is "26."