There are two triangles with the same area. The base of one triangle is 12 cm long and the height is twice the base; the height of the other triangle is 20 cm. What is the length of the base where the height lies?
有两个面积相等的三角形，一个三角形底长12厘米，高是底的2倍；另一个三角形的高是20厘米，这条高所在的底边长多少？
<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">12 * 12 * (1/10)</gadget>
<output>72/5 = around 14.4</output>

<result>72/5 = around 14.4</result>