The children line up in a triangular formation to play games, and there are 15 people standing on each side. So, how many people are standing in this triangle team?
小朋友们排成一个三角形队形做游戏，每边站了15人，那么，这个三角形队共站了多少人？
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<gadget id="calculator">45 - 3</gadget>
<output>42</output>

<result>42</result>