From January to June 2008, Uncle Wang received a total of 270 mails, among which the ratio of ordinary mails to e-mails was 2:7. How many ordinary mails did he receive?
王叔叔在2008年1月～6月间，共收邮件270封，其中普通邮件和电子邮件的比是2：7，他收到的普通邮件是多少封．
<gadget id="calculator">2 + 7</gadget>
<output>9</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">270 * (2/9)</gadget>
<output>60</output>

<result>60</result>