If the length of a rectangle is increased in the ratio 4 : 5 and its breadth is decreased in the ratio 3 : 2, then its area will be decreased in the ratio ............
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 6 : 5
Let initial length and breadth of rectangle be 4x and 3y
let changed length and breadth of rectangle be 5x and 2y
Initial area = 4x × 3y = 12xy
Final area = 5x × 2y = 10xy
area will be decreased in the ratio of 12xy : 10xy = 6 : 5