In a certain exam, there were several original exam rooms. If two examination rooms are added, each examination room can accommodate exactly 48 people; if two examination rooms are reduced, each examination room can accommodate exactly 60 people. How many examination rooms were there?
某次考试中，原有考室若干间．如果增加2间考室，每间考室正好坐48人；如果减少2间考室，每间考室正好坐60人．原来有考室多少间？
<gadget id="calculator">48 * 2</gadget>
<output>96</output>

<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<gadget id="calculator">96 + 120</gadget>
<output>216</output>

<gadget id="calculator">60 - 48</gadget>
<output>12</output>

<gadget id="calculator">216 / 12</gadget>
<output>18</output>

<result>18</result>