There is a rectangular flowerbed in Heping Primary School. When building the campus, the length of the flowerbed was reduced by 5 meters and the width was increased by 3 meters to form a square. It is known that the area of the part whose width is increased by 3 meters is 45 square meters. How much is the area of the flowerbed reduced? square meter?
和平小学有一块长方形花圃，在修建校园时，花圃的长减少5米，宽增加3米，变成了一个正方形，已知宽增加3米的部分面积是45平方米，花圃的面积减少了多少平方米？
<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<gadget id="calculator">15 - 5</gadget>
<output>10</output>

<gadget id="calculator">10 - 3</gadget>
<output>7</output>

<gadget id="calculator">15 * 7</gadget>
<output>105</output>

<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">105 - 100</gadget>
<output>5</output>

<result>5</result>