The perimeter of an isosceles triangle is 35 cm, and the ratio of the length of the waist to the length of the base is 2:3, what is the length of the base in cm?
一个等腰三角形的周长是35厘米，腰与底边长度的比是2：3，则底边长是多少厘米．
<gadget id="calculator">2 + 2 + 3</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">35 * (3/7)</gadget>
<output>15</output>

<result>15</result>