An uncertain number of persons are sitting in a line facing the same direction. D is to the immediate left of A. Five persons sit between G and H. Two persons sit between E and F. Five persons sit between B and E. D is at the left end of the line. H is at the othe r end. Three persons sit between A and B. F is to the immediate left of G. E, B and A are towards the left of F. How many persons are sitting in the line?

Seven boxes B, C, D, I, J, K and L are kept one over the other but not necessarily in the same order. Only I is kept above C. Only L is kept between C and J. Only K is kept below D. How many boxes are kept between B and I?

Seven people, M, N, O, P, Q, R, and S are sitting in a straight line, facing North. Only two people sit to the right of Q. Only two people sit between Q and M. N sits second to the right of M. P sits to the immediate right of R. O sits at one of the positions to the left of S. Who sits at the extreme left end of the line?