Question
In a row A is 13th from the left and B is 16th from the
right, after interchanging their positions A becomes 27th from the left. Find the total no of persons in a row?Solution
     Total no of persons in a row = person position after change +  other person position before change – 1         Total no of persons in a row = (27 + 16)-1                                                            =42
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