There are 180 students in the fifth grade, each of whom participates in at least one extracurricular activity, of which (2/3) participate in science and technology activities, (1/2) participate in foreign language groups, how many students participate in these two activities ．
五年级有180名学生，每人至少参加一项课外活动，其中(2/3)的人参加了科技活动，(1/2)的人参加了外语小组，这两项活动参加的有多少人．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(2/3) + (1/2)</gadget>
<output>7/6 = around 1.166667</output>

<gadget id="calculator">180 * (7/6)</gadget>
<output>210</output>

<gadget id="calculator">210 - 180</gadget>
<output>30</output>

<result>30</result>