Respuesta :
I hope this helps you
width=4/5.length
width×length =320
4/5.length ×length =320
length ^2=400
length =20
width =16
width=4/5.length
width×length =320
4/5.length ×length =320
length ^2=400
length =20
width =16
lenght - a
width - b
Area= a*b
320=ab
b=4/5a
320= 4a^{2}/5
400= a^{2}
a= \sqrt{400}
a=20
b=16