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(surface area of cube 1 or 2 (either)) times 2 = (total surface area of two identical cubes)
Surface area of two cubes = 6 times [ (length of first cube's edge)2 + (length of second cube's edge)2 ]
Find the area to one side of one of the cubes and multiply it by 18
The edge lengths are: 7 cm
that depends on how big the ice cubes are, advice: pay attention in class!