The students participated in the gymnastics performance at the Tourism Festival. There are 8 people in front of Xiaolin, 6 people in the back, 10 people in the left side, and 9 people in the right side. The number of people in each row is the same. How many people do exercises in total?
同学们参加旅游节体操表演．小林前面有8人，后面有6人，左边有10人，右边有9人，每行的人数同样多，做操的共有多少人．
<gadget id="calculator">10 + 9 + 1</gadget>
<output>20</output>

<gadget id="calculator">8 + 6 + 1</gadget>
<output>15</output>

<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<result>300</result>