There is a tourist group going boating, the tour guide calculates, if one more boat is added, each boat can take exactly 6 people, if one boat is reduced, each boat can take exactly 9 people, how many people are there in this tour group?
有一个旅游团去划船，导游算了一下，如果增加一条船，正好每船坐6人，如果减少一条船，正好每条船坐9人，这个旅游团共有多少人．
<gadget id="calculator">9 + 6</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 + 1</gadget>
<output>6</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<result>36</result>