A rectangular vegetable garden is surrounded by a fence 42 meters long, and the ratio of length to width is 4:3. What is the area of the rectangular vegetable garden in square meters?
一块长方形的菜园，周围篱笆长42米，长和宽的比是4：3．这块长方形菜园的面积是多少平方米？
<gadget id="calculator">42 / 2</gadget>
<output>21</output>

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

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">21 * (4/7)</gadget>
<output>12</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">21 * (3/7)</gadget>
<output>9</output>

<gadget id="calculator">12 * 9</gadget>
<output>108</output>

<result>108</result>