The 18 students were divided into 6 comic books on average, and several students came. Everyone redistributed, and each person got 4 copies on average. Ask: How many students came?
18个同学分连环画平均每人分到6本，又来了若干个同学，大家重新分配，平均每人分到4本，问：来了几个同学？
<gadget id="calculator">18 * 6</gadget>
<output>108</output>

<gadget id="calculator">108 / 4</gadget>
<output>27</output>

<gadget id="calculator">27 - 18</gadget>
<output>9</output>

<result>9</result>