The tour group booked a number of rooms for tourists in the hotel on the island. If there are 4 people in one room, 13 beds will be vacated, and if there are 6 people in one room, 29 beds will be vacated. How many people are there to explore the island? ?
旅行团在小岛的旅馆为游客订了若干个房间，如果4人一间就空出13个床位，如果6人一间就空出29个床位，这次到小岛探秘的一共有多少人？
<gadget id="calculator">29 - 13</gadget>
<output>16</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">32 - 13</gadget>
<output>19</output>

<result>19</result>