Richard is 15th from the front in a column of boys. There are thrice as many boys behind him as there are in front of him. How many boys are there between Richard and the 7th boy from the end of the column?

Among five people named V, W, X, Y and Z, each has a different age. Z is older than Y but younger than W. X is older than V but younger than Y. Who among them is the second oldest?

In a row of students facing North, P was standing 17th from the left end and 23rd from the right end. If Q was standing exactly in the middle of the row, what was Q's position from the left end?