The perimeter of a rectangle is 50 cm, and the ratio of length to width is 3:2, what is its area?
一个长方形的周长是50厘米，长于宽的比是3：2，它的面积是多少．
<gadget id="calculator">50 / 2</gadget>
<output>25</output>

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

<gadget id="calculator">25 / 5</gadget>
<output>5</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<result>150</result>