Solution :

A's position from left = 14th B's position from right = 7th Number of people to the left of A = 13 Number of people in between A and B = 13×3=39 So, position of B from left end = 14+39+1 = 54th from left end B is 54th from left end and 7th from right end . Total number of people in the row = 54+7-1 = 60

My answer 60

60