General Studies · Seating Arrangement

Eight boxes - P, Q, R, S, T, U, V, and Y are placed one above the other in a vertical stack, not necessarily in the same order. Three boxes are placed between P and Q. Box Y is placed immediately below P. There are two boxes between Y and V. There are as many boxes between R and S as between Y and Q. Box R is kept above S. Box T is kept immediately below box S. Three boxes are kept between T and U. How many boxes are placed above box S?