In a row of boys facing the North, M is 17th from the left end and P is 17th from the right end. L, who is 5th to the right of M, is 6th to the left of P in the row. How many boys are there in the row?
44
Clearly, according to the given conditions, there are 16 boys to the left of M, as well as to the right of P. Also, L lies between M and P such that there are 4 boys between M and L and 5 boys between L and P.
So, number of boys in the row = (16 + 1 + 4 + 1 + 5 + 1 + 16) = 44