A mathematics extracurricular activity group in a certain school has 8 people in each group. Later, due to work needs, it was reorganized and each group was changed to 12 people, so 2 groups were reduced. Ask how many people in the school participate in the mathematics extracurricular activities group.
某校数学课外活动组，每组8人，后因工作需要，又重新编组，每组改为12人，因此减少了2组．问该校共有多少人参加数学课外活动组．
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">8 * (1/2)</gadget>
<output>4</output>

<gadget id="calculator">4 * 12</gadget>
<output>48</output>

<result>48</result>