x Area A= x*y
l------------------------------l Perimetro P= 2x+2y = 225
l l y Cambia la figura y nos queda
l l A"= (x - 5 )( y+5)=A+175
l------------------------------l =xy+5x-5y-25= xy+175
5x-5y=175+25
x-y=40 entonces x=40+y
P= 2(40-y)+2y=225
80+2y+2y=225
4y=225-80
y=145/4
Si x=40+y= 40+145/4
= 160/4 + 145/4
x = 305/4