The teacher arranges rooms for the children participating in the summer camp. If all four-person rooms are arranged, exactly 6 rooms are needed. If all three-person rooms are arranged, how many rooms are needed?
老师给参加夏令营的小朋友安排房间，如果都安排四人间正好需要6间，如果都安排三人间需要几间？
<gadget id="calculator">6 / 3</gadget>
<output>2</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>