There are 82 people in Class A and Class B. If 4 people are transferred from Class A to Class B, the number of people in the two classes is exactly equal. How many people are there in Class B?
甲、乙两班共有82人，如果从甲班调4人到乙班，两班人数正好相等，原来乙班有多少人．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">82 - 8</gadget>
<output>74</output>

<gadget id="calculator">74 / 2</gadget>
<output>37</output>

<result>37</result>