There were 18 students who divided the apples, and each of them got 6 apples on average. Some students came, and everyone divided the apples again, and each of them got 3 apples on average. After counting, how many people came.
有18名同学分苹果，平均每人分到6个，又来了一些同学，大家重新分苹果，平均每人分到3个，算一算，又来了多少人．
<gadget id="calculator">18 * 6</gadget>
<output>108</output>

<gadget id="calculator">108 / 3</gadget>
<output>36</output>

<gadget id="calculator">36 - 18</gadget>
<output>18</output>

<result>18</result>