If the length and breadth of a room are increased by y feet each, the perimeter increases by 16 feet. Find y	Options.
A) 8	B) 2	C) 6	D) 4	E) 3

Rationale: 2 ( l + b ) = x ; 2 ( l + y + b + y ) = x + 16 ; 2 ( l + b ) + 4 y = x + 16 ; x + 4 y = x + 16 ; y = 4 answer : d
Answer: D