There are 4 classes in the second grade, and each class sends 5 students to participate in the running competition. How many students participated in the competition?
二年级有4个班，每个班派出5名同学参加跑步比赛．参加比赛的一共有多少名同学呢？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>