There are 84 students in Class A and Class B. If two students are transferred from each class, the ratio of the number of students in the two classes is 11:9. How many students are there in Class B?
甲、乙两班共有学生84人，如果两班各转走2人，则两班人数的比是11：9，原来乙班有多少人．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">84 - 4</gadget>
<output>80</output>

<gadget id="calculator">11 + 9</gadget>
<output>20</output>

<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">80 * (9/20)</gadget>
<output>36</output>

<gadget id="calculator">36 + 2</gadget>
<output>38</output>

<result>38</result>