If the perimeter of a rectangle is 100 cm and the ratio of length to width is 3:2, what is its area in square centimeters?
一个长方形的周长是100厘米，长与宽的比是3：2，它的面积是多少平方厘米．
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">50 * (3/5)</gadget>
<output>30</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">50 * (2/5)</gadget>
<output>20</output>

<gadget id="calculator">30 * 20</gadget>
<output>600</output>

<result>600</result>