There are 644 students in the experimental primary school, and the number of girls is 3/4 of the number of boys. How many girls are there in the experimental primary school?
实验小学有学生644人，其中女生人数是男生人数的(3/4)，实验小学女生有多少人？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 + (3/4)</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">644 / (7/4)</gadget>
<output>368</output>

<gadget id="calculator">644 - 368</gadget>
<output>276</output>

<result>276</result>