There are two classes in the sixth grade of a certain school. The number of boys in the last semester is 5/4 of the number of girls. This semester, 3 girls are transferred, so the ratio of boys to girls is 8:7. How many girls are there now?
某校六年级有两个班，上学期男生人数是女生人数的(5/4)，这学期又转入3名女生，这样男生与女生的人数比为8：7．现在有女生多少人？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(7/8) - (4/5)</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">3 / (3/40)</gadget>
<output>40</output>

<gadget id="calculator">40 * (7/8)</gadget>
<output>35</output>

<result>35</result>