There are 3 people in Cong Cong's family, and the original living area is 75 square meters. After moving into the new house, the living area is 120 square meters. How much has the per capita living area of Cong Cong's family increased compared to the original one?
聪聪家有3口人，原来居住面积是75平方米．搬入新居后，居住面积有120平方米，聪聪家人均居住面积比原来增加了多少？
<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<gadget id="calculator">75 / 3</gadget>
<output>25</output>

<gadget id="calculator">40 - 25</gadget>
<output>15</output>

<result>15</result>