The ratio of the base to the length of a waist of an isosceles triangle is 3:2, and the circumference is 35 cm. So, how many centimeters is the base of this triangle?
一个等腰三角形的底边与一条腰的长度之比是3：2，周长是35厘米．那么，这个三角形底边是多少厘米．
<gadget id="calculator">3 + 2 + 2</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>