Among the students reading in the reading room, male students accounted for (4/7). After 14 male students walked out of the reading room, among the students reading books, female students accounted for (11/21). How many students were reading in the reading room? ?
阅览室看书的同学中，男同学占(4/7)，从阅览室走出14位男同学后，看书的同学中，女同学占(11/21)，原来阅览室一共有多少名同学在看书？
<gadget id="calculator">7 - 4</gadget>
<output>3</output>

<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">21 - 11</gadget>
<output>10</output>

<gadget id="calculator">10 / 11</gadget>
<output>10/11 = around 0.909091</output>

<gadget id="calculator">(4/3) - (10/11)</gadget>
<output>14/33 = around 0.424242</output>

<gadget id="calculator">14 / (14/33)</gadget>
<output>33</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 - (4/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">33 / (3/7)</gadget>
<output>77</output>

<result>77</result>