The Xiaobing family has three members, with a housing area of 86.1 square meters; the Xiaoyang family has five members, with a housing area of 139.5 square meters. Who has the largest average living space? How big is it?
小冰家三口人，住房面积是86.1平方米；小洋家五口人，住房面积是139.5平方米．谁家的平均住房面积大？大多少？
<gadget id="calculator">86.1 / 3</gadget>
<output>28.7</output>

<gadget id="calculator">139.5 / 5</gadget>
<output>27.9</output>

<gadget id="calculator">28.7 - 27.9</gadget>
<output>0.8</output>

<result>0.8</result>