Zhang Hong’s family has three members, with a living area of 84 square meters; Li Tian’s family has four members, with a living area of 104 square meters. Which family has the largest per capita living area? How big is it?
张红家三口人，居住面积是84平方米；李天家四口人，居住面积是104平方米．谁家的人均居住面积大？大多少？
<gadget id="calculator">84 / 3</gadget>
<output>28</output>

<gadget id="calculator">28 - 24</gadget>
<output>4</output>

<result>4</result>