Length of a rectangular field is increased by 10 meters and breadth is decreased by 4 meters area of...........

Quantitative Aptitude ( CCS) Mensuration 2D

Length of a rectangular field is increased by 10 meters and breadth is decreased by 4 meters, area of the field remains unchanged. If the length decreased by 5 meters and breadth is increased by 7 meters, again the area remains unchanged. Find the length and breadth of the rectangular field.

12, 11

13, 12

13,11

14,12

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Explanation:

Answer & Explanation
Answer – c) 13,11
Explanation :
Length = l and breadth = b,
(l +10)*(b-4) = lb and (l-5)*(b+7) = lb
Solve both equation to get l and b