A 60 cm long wire is used to form an isosceles triangle. If the length ratio of the waist to the base is 2:1, what is the length of the waist in centimeters?
用60厘米长的铁丝围成一个等腰三角形，已知腰和底的长度比是2：1，则腰长为多少厘米．
<gadget id="calculator">2 / 2 / 1</gadget>
<output>1</output>

<gadget id="calculator">2 + 2 + 1</gadget>
<output>5</output>

<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>24</result>