Question
How many persons sit in the
row? Answer the questions based on the information given below: Certain number of persons sits in a straight row facing north. T doesn’t sit adjacent to Y. Five persons sit between V and Z. X sits exactly between V and Z. Five persons sit between X and T. Y sits fourth to the right of V. Z sits second from one of the extreme ends. Two persons sit between T and S. Number of persons to the right of S is two more than those to the left of V. W sits third to the right of U, who sits exactly in the middle of the row.Solution
Five persons sit between V and Z. X sits exactly between V and Z. Five persons sit between X and T. Y sits fourth to the right of V. Z sits second from one of the extreme ends. T doesn’t sit adjacent to Y. There will be two cases: If Z sits second for the left end, then V will sit sixth to the right of Z. X will sit either third to the right of Z or third to the left of V. T will sit sixth to the right of X. This case will get discarded as T doesn’t sit adjacent to Y. _____ Z ____ _____ X _____ _____ V _____ ______ T Y Case 1. If Z sits second for the right end, then V will sit sixth to the left of Z. X will sit either left to the right of Z or third to the right of V. T will sit sixth to the left of X. T ______ ______ V _____ _____ X Y _____ Z _____ Case 2. Two persons sit between T and S. Number of persons to the right of S is two more than those to the left of V. W sits third to the right of U, who sits exactly in the middle of the row. S sits third to the left of T. We know that 13 persons are sitting to the right of S. So, number of person sitting to the left of V = 13 – 2 = 11. Now, total number of persons in a row is 19 and U sits exactly in the middle of the row. Sp, U will either tenth to the right or left end of the row. ______ ______ ______ ______ ______ S ______ ______ T U ______ V W _____ X Y _____ Z _____ Case 2. Final arrangement a shown below: _____ ____ _____ ______ _____ S ____ _____ T U ____ V W _____ X Y ____ Z ____
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