Use 48 cm wire to form a triangle (not counting the joints). The length ratio of the three sides of this triangle is 3:4:5. What is the longest side in centimeters?
用48厘米的铁丝围成一个三角形(接口处不计)，这个三角形三条边的长度比是3：4：5，最长的边是多少厘米．
<gadget id="calculator">3 + 4 + 5</gadget>
<output>12</output>

<gadget id="calculator">48 / 12</gadget>
<output>4</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<result>20</result>