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Railways PYQCBT 1 2016

RRB NTPC · Question 22

If the length (L cm) and breadth (B cm) of a rectangle are increased by 25%. find the difference between the areas of the old and new rectangles. A. 3LB/2 sq.cm B. 24LB/9 sq.cm C. 9LB/16 sq.cm D. 16LB/9 sq.cm

  1. D

  2. A

  3. C

  4. B

Show answer & explanation

Answer: (C) C

Explanation

The new sides are 1.25L and 1.25B, so the new area = 1.5625 LB = (25/16) LB. The difference from the old area = 25LB/16 − LB = 9LB/16 sq. cm.