The perimeter of a triangle vegetable field is 168 meters, and the ratio of side lengths is 4:3:5. What is the length of the longest side in meters?
三角形菜地的周长168米，边长的比是4：3：5，最长的边长是多少米．
<gadget id="calculator">4 + 3 + 5</gadget>
<output>12</output>

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

<gadget id="calculator">168 * (5/12)</gadget>
<output>70</output>

<result>70</result>