There are no more than 50 students in a certain class. In the morning of New Year's Day, all the students in the class (2/9) go to participate in the singing competition, and the whole class (1/4) go to play table tennis, while the rest of the students go to the movies. how many people.
某班学生不超过50人，元旦上午全班学生的(2/9)去参加歌咏比赛，全班(1/4)去打乒乓球，而其余的学生都去看电影，则看电影的学生有多少人．
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/9) + (1/4)</gadget>
<output>17/36 = around 0.472222</output>

<gadget id="calculator">1 - (17/36)</gadget>
<output>19/36 = around 0.527778</output>

<gadget id="calculator">36 * (19/36)</gadget>
<output>19</output>

<result>19</result>