In a row, Amit is 12th from the left and Sunil is 15th from the right. After they interchange their positions, Amit becomes 17th from the left. What is the total number of persons in the row?
31
After Amit and Sunil interchange positions, Amit is at Sunil's original position.
So Sunil's original position from the left = 17.
Sunil was 15th from the right and now we know he is 17th from the left.
Using: Total = (position from left) + (position from right) − 1
\(\text{Total} = 17 + 15 - 1 = 31\)
Hence the total number of persons is 31.
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