The perimeter of a triangle is 36 cm, and the length ratio of the three sides is 5:4:3, what is the longest side in cm?
一个三角形的周长是36厘米，三条边的长度比是5：4：3，其中最长的一条边是多少厘米．
<gadget id="calculator">5 + 4 + 3</gadget>
<output>12</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">36 * (5/12)</gadget>
<output>15</output>

<result>15</result>