what is the missing number for the problem bottom left cornerd
I WILL GIVE BRAINLIEST

Answer:
length = 10
Step-by-step explanation:
Volune = L W H
H=40
W=8
L=X
40*8*X = 3200
320 X = 3200
X = 10
Volume : 40 x 8 x10 = 3200