Respuesta :

To find the volume, the equation is
L×H×W=V
You can now put you numbers in the equation
L×5×H=420
If is L is 5 longer than 4W, L=4W+5
So
(4x+5)×(5)×(x) = 420
Now you remove your 5
(4x+5)×(x) = 84
You now have (5x+5)=84
5x=79
x=15.8