The building has 42 storage units that are a total of 5040 square feet. Twenty of the units are 8 by 4 feet each. If the remaining units are all the same size, what is the area, in square feet, for one of the remaining units?
8 * 4 = 
<gadget id="calculator">8*4</gadget>
<output>32</output>
32 square feet
20 * 32 = 
<gadget id="calculator">20*32</gadget>
<output>640</output>
640 square feet
5040 - 640 = 
<gadget id="calculator">5040-640</gadget>
<output>4_400</output>
4400 square feet.
There are 42 - 20 = 
<gadget id="calculator">42-20</gadget>
<output>22</output>
22 remaining units
4400/22 = 
<gadget id="calculator">4400/22</gadget>
<output>200</output>
200 square feet.
One of the remaining units is 200 square feet.

<result>200</result>