Kamal’s position from the left end in a row of boys is 31 st and Karan’s position from the right end is 29 th . After interchanging their position, Kamal's position becomes 43 rd from the left end. How many boys are there in the row?
Karan's position from right end = 29th
When they interchange their positions,
=> Karan's initial position = Kamal's final position from left end = 43rd
Thus, total boys in the row = $$(43+29)-1=72-1=71$$
=> Ans - (B)
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