when gavin opens cereal box and lays it out flat he sees both top and bottom

when gavin opens a cereal box and lays it out flat, he sees that both the top and the bottom of the box measure 3inches by 7 inches. Both sides of the box measure 3 inches by 10 inches, and both the front and back of the box measure 7 inches by 10 inches. What is the surface area of the cereal box?

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