There are 36 students reading in the reading room, among them girls accounted for (4/9), how many girls came to read later, the number of girls accounted for 50% of all the students who read at this time, how many girls came to read later?
阅览室里有36名学生在看书，其中女生占(4/9)，后来又有几名女生来看书，这时女生人数占所有看书人数的50%，后来又有多少名女生来看书？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">36 * (4/9)</gadget>
<output>16</output>

<gadget id="calculator">36 - 16</gadget>
<output>20</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">20 / (1/2)</gadget>
<output>40</output>

<gadget id="calculator">40 - 36</gadget>
<output>4</output>

<result>4</result>