There are 95 students in the third grade plan to participate in tree planting, with an average of 4 trees per person. Due to special reasons, some students were not able to participate in the tree planting. As a result, each person planted 5 trees on average. How many students did not participate in the tree planting?
三年级计划有95名同学参加植树，平均每人植树4棵．由于特殊原因，有的同学没能参加，结果平均每人植树5棵，有几个同学没有参加植树？
<gadget id="calculator">95 * 5</gadget>
<output>475</output>

<gadget id="calculator">95 * 4</gadget>
<output>380</output>

<gadget id="calculator">475 - 380</gadget>
<output>95</output>

<gadget id="calculator">95 / 5</gadget>
<output>19</output>

<result>19</result>