The perimeter of an isosceles triangle is 60 cm, and the ratio of the two adjacent sides is 2:1, what is the base of the isosceles triangle in cm?
一个等腰三角形周长是60厘米，相邻两条边的比是2：1，这个等腰三角形的底边是多少厘米．
<gadget id="calculator">2 + 2 + 1</gadget>
<output>5</output>

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

<result>12</result>