Seven friends S, T, U, V, W, X and Y, each has scored different marks in an examination. W scored more than X but less than V. Only three people scored more than V. T scored more than U but less than S. Y scored the least among all. How many persons scored between T and X?

3

According to the given statements as below:

1) W scored more than X but less than V. 

⇒ X < W < V  

2) T scored more than U but less than S.

⇒ U < T < S

3) Y scored the least among all.

⇒ Y < X

4) Only three people scored more than V.

⇒ V < three people

⇒ V < U < T < S

Thus, combining all the given statements, we will get,

⇒ Y < X < W < V < U < T < S

so, only 3 persons scored between T and X.