Class 1 of the sixth grade participated in voluntary labor, and planned to send 16 students to plant trees, with an average of 3 trees per person. Later, some students were added, and at this time, only 2 trees were planted per person on average. How many students have been added?
六年级1班参加义务劳动，计划派16名同学去植树，平均每人要植3棵，后来增加了一些同学，这时平均每人只需植树2棵．问增加了多少名同学？
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">16 * (3/2)</gadget>
<output>24</output>

<gadget id="calculator">24 - 16</gadget>
<output>8</output>

<result>8</result>