Answer:
135*
Step-by-step explanation:
trust me 
 
        
             
        
        
        
X=12
-5+17=12 - this is the quickest way to solve an easy equation like this
        
             
        
        
        
The answer can be found by subtract the volume of the small box from the volume of big box.
Volume of the small box:
12*8*4= 384 inches cube
Volume of the big box:
20*15*9= 2700 inches cube
The space left:
2700 - 384 = 2316 inches cube
        
             
        
        
        
Answer:
288 cm³
Step-by-step explanation:
cuboid formular: lengtg×width×height