John builds a box.  The box is 26 inches by 26 inches by 14 inches.  The walls are 1 inch thick on each side.  How much is the internal volume in cubic feet?
The walls take away 2*1=
<gadget id="calculator">2*1</gadget>
<output>2</output>
2 inches from each dimension.
So the longer sides are 26-2=
<gadget id="calculator">26-2</gadget>
<output>24</output>
24 inches.
That is 24/12=
<gadget id="calculator">24/12</gadget>
<output>2</output>
2 feet.
The smaller dimension is 14-2=
<gadget id="calculator">14-2</gadget>
<output>12</output>
12 inches.
That is 12/12=
<gadget id="calculator">12/12</gadget>
<output>1</output>
1 foot.
So the internal volume is 2*2*1=
<gadget id="calculator">2*2*1</gadget>
<output>4</output>
4 cubic feet.

<result>4</result>