The perimeter of an isosceles triangle is 40 cm and the ratio of the waist to the base is 3:2. What is the length of the base of this triangle in centimeters.
一个等腰三角形的周长是40厘米，腰与底边长比是3：2．这个三角形的底边长是多少厘米．
<gadget id="calculator">3 + 3 + 2</gadget>
<output>8</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">40 * (1/4)</gadget>
<output>10</output>

<result>10</result>