A certain class of students go rowing, if one more boat is added, then each boat will take exactly 6 people; if one less boat is required, then each boat will take 9 people. Q: How many students are there?
某班学生去划船，如果增加一条船，那么每条船正好坐6人；如果减少一条船，那么每条船就要坐9人．问：学生有多少人？
<gadget id="calculator">6 + 9</gadget>
<output>15</output>

<gadget id="calculator">9 - 6</gadget>
<output>3</output>

<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">30 + 6</gadget>
<output>36</output>

<result>36</result>