What the surface area of a box with length of 12 inches a width of 7 inches and a height of 6 inches?

- Area of the bottom = (12 x 7) = 94 square inches.

Area of the top = same as the bottom.

- Area of the right side = (12 x 6) = 72 square inches.

Area of left side = same as right side.

- Area of the front end = (7 x 6) = 42 square inches.

Area of the back end = same as the front end.

Simply add these up.