There are 36 students reading in the reading room of the school, of which girls accounted for (4/9). Later, a few girls came to read the books. At this time, the number of girls accounted for (1/2) of all the students who read books. How many students came later? Girls come to read books?
学校阅览室有36名学生在看书，其中女生占(4/9)，后来又来了几名女生来看书，这时女生人数占所有看书人数的(1/2)，求后来又有几名女生来看书？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 - (4/9)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 / 2</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">(5/9) / (1/2)</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">36 * (10/9)</gadget>
<output>40</output>

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

<result>4</result>