A hotel has three-person rooms and two-person rooms, which can accommodate 385 people in total, of which there are 75 three-person rooms, how many two-person rooms are there? (solution by equation)
一个宾馆，有三人房间和两人房间，共能容纳385人，其中三人房间的有75个，两人房间有多少个？(用方程解)
<gadget id="calculator">3 * 75</gadget>
<output>225</output>

<gadget id="calculator">385 - 225</gadget>
<output>160</output>

<gadget id="calculator">160 / 2</gadget>
<output>80</output>

<result>80</result>