A 30 cm long iron wire is used to form a rectangle, the ratio of length to width is 3:2, then what is the width of the rectangle in cm?
用一根长30厘米的铁丝围成一个长方形，长与宽的比是3：2，那么这个长方形的宽是多少厘米．
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

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

<gadget id="calculator">(2/5) / 2</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">30 * (1/5)</gadget>
<output>6</output>

<result>6</result>