Jef put a small box that is 12 inches long, 8 inches wide, and 4 inches tall inside a box that is 20 inches long,15 inches wide, and9 inches high. how much space is left in the larger box?

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

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X=y+4 is the answe