That would be 2 * 10*20 + 2 * 12*20 + 10*12
= 400 + 480 + 120
= 800 in^2
Area of rectangle: b*h
12*5=60
10*5=50
(60*4)+(50*4)=440
The total surface area of the visible sides of the boxes would be 440 square inches.
Hope this helps!
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