Use 84 cm long iron wire to form a triangle. The ratio of the lengths of the three sides of this triangle is 3:4:5. What is the longest side in centimeters.
用84厘米长的铁丝围成一个三角形，这个三角形三条边长度的比是3：4：5．其中最长的边是多少厘米．
<gadget id="calculator">3 + 4 + 5</gadget>
<output>12</output>

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

<gadget id="calculator">84 * (5/12)</gadget>
<output>35</output>

<result>35</result>