Answer the questions based on the information given below. There are seven boxes R, S, T, U, V, W and X have different weights. Box R is heavier than at least two boxes. Number of boxes heavier than box U is equal to number of boxes lighter than box
V. Box S is heavier than box R. Box U is heavier than box I and box S but not the heaviest. Box S is not the 3rd heaviest box. Box X is heavier than box W, which is lighter than box
V.   Which box is the lightest?

Box R is heavier than at least two boxes. Box U is heavier than box T and box S but not the heaviest. Number of boxes heavier than box U is equal to number of boxes lighter than box V. Box S is heavier than box R. Box S is not the 3rd heaviest box. Box X is heavier than box W which is lighter than box V. So, box U and box V must be 2nd heaviest and 2nd lightest boxes respectively. Also, As, box S is not the 3rd heaviest, so, T must be 3rd heaviest and X must be heaviest box. The arrangement is shown below, X > U > T > S > R > V >. W