A rectangular swimming pool has a bottom circumference of 60 meters, a depth of 2 meters, and a ratio of length to width of 7:3. How many square meters does this swimming pool occupy?
一块长方形游泳池的底面周长是60米，深2米，长与宽的比是7：3，这个游泳池的占地面积是多少平方米？
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

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

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">30 * (7/10)</gadget>
<output>21</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">30 * (3/10)</gadget>
<output>9</output>

<gadget id="calculator">21 * 9</gadget>
<output>189</output>

<result>189</result>