Answer :

6) 18
8) They have the same volume because to find the volume you multiply base * height * width. So Bill's box is 8*20*6= 960 and Martin's box is 4*15*16= 960
10)  V = LWH 
V = 5 * 5 * 6 
V = 150 cubic feet 

150/15 = 10 tons per cubic foot

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