The perimeter of an isosceles triangle is 48 cm, and the ratio of two adjacent sides is 2:5. What is the length of the base of this triangle?
一个等腰三角形的周长是48cm，相邻两边之比是2：5，这个三角形底边长多少．
<gadget id="calculator">2 + 5 + 5</gadget>
<output>12</output>

<gadget id="calculator">2 / 12</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">48 * (1/6)</gadget>
<output>8</output>

<result>8</result>