Students participating in science and technology group activities are divided into groups, and the number of each group is the same. If it is divided into 12 groups, there will be 15 more people; if it is divided into 9 groups, there will be 27 more people. How many people participate in the science and technology group? (equation solution)
参加科技小组活动的同学分组，每组人数同样多．如果分成12个小组，则多15人；如果分成9个小组，则多27人．参加科技小组的由多少人？(方程解)
<gadget id="calculator">27 - 15</gadget>
<output>12</output>

<gadget id="calculator">12 - 9</gadget>
<output>3</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

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

<gadget id="calculator">48 + 15</gadget>
<output>63</output>

<result>63</result>