The ratio of the three sides of a triangle is 3:4:5, and the shortest side is 15 cm, what is the perimeter of the triangle in cm?
一个三角形三条边的比是3：4：5，最短的一条边是15厘米，则这个三角形的周长是多少厘米．
<gadget id="calculator">12 * 5</gadget>
<output>60</output>

<result>60</result>