"The length of a rectangle is decreased by `r %`, and the breadth is increased by `(r+5)%`.
Channel: Doubtnut
Date: 2020-04-05

"The length
 of a rectangle is decreased by `r %`
, and the
 breadth is increased by `(r+5)%`
. Find `r`
, if the
 area of the rectangle is unaltered.
(a) 5 (b) 8 (c) 10
(d) 15 (e) 20"