There are 3 people in Mingming's family, and the original living area is 75 square meters. After moving into the new house, the per capita area is 40 square meters. How many square meters is the area of Mingming's new house larger than before?
明明家有3口人，原来居住面积是75平方米．搬入新居后，人均面积是40平方米．明明家新居面积比原来多了多少平方米？
<gadget id="calculator">40 * 3</gadget>
<output>120</output>

<gadget id="calculator">120 - 75</gadget>
<output>45</output>

<result>45</result>