After the implementation of the so-called "the strictest new traffic regulations in history", there have been many public opinions from all walks of life. A reporter from Huai'an TV station randomly surveyed 56 drivers on the road, and the ratio of those who expressed understanding to those who opposed it was 5:2. How many of the drivers surveyed were against it?
号称"史上最严新交规"实施以后，社会各界舆论纷纷．淮安电视台记者在路上随意调查了56名驾驶员，表示理解的和反对的人数比是5：2．被调查的驾驶员中反对的有多少人？
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">56 * (2/7)</gadget>
<output>16</output>

<result>16</result>