rectangular vegetable field is 25 meters long and 12 meters wide. If the width is increased to 1.5 times the original size and the length remains the same, how many square meters will the area of the vegetable field increase?
一块长方形菜地，长25米，宽12米．如果宽扩大到原来的1.5倍，长不变，那么菜地的面积会增加多少平方米？
<gadget id="calculator">12 * 1.5</gadget>
<output>18</output>

<gadget id="calculator">25 * 18</gadget>
<output>450</output>

<gadget id="calculator">25 * 12</gadget>
<output>300</output>

<gadget id="calculator">450 - 300</gadget>
<output>150</output>

<result>150</result>