All the students in Class 1 of the fifth year of Hongxing Primary School have participated in the extracurricular activity group, half of them have joined the sports group, half of the remaining students have joined the art group, and the rest have joined the science and technology group. The known number of participants in the science and technology group is If there are 12 people, how many people are there in the fifth grade?
红星小学五年一班全体同学都参加了课外活动小组，其中一半的同学参加了体育小组，剩下的同学有一半参加了文艺小组，其余同学参加了科技小组，已知参加科技小组的人数是12人，则五年级一共有多少人？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">12 / (1/4)</gadget>
<output>48</output>

<result>48</result>