It is known that the perimeter of a rectangle is 24 meters and the length is twice the width. If its length and width are each increased by 3 meters, how many square meters will its area increase?
已知一个长方形的周长是24米，长是宽的2倍．如果它的长和宽各增加3米，那么面积将会增加多少平方米？
<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 3</gadget>
<output>11</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">11 * 7</gadget>
<output>77</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">77 - 32</gadget>
<output>45</output>

<result>45</result>