There are 42 students in Class 1 and 48 students in Class 2 of the fifth grade. Two classes are divided into groups to participate in tree planting activities. If the number of people in each group of the two classes must be the same and the number of people in each group is required to be as large as possible, how many groups can they be divided into?
五年级1班有42人，2班有48人．两班一起分组参加植树活动，如果两个班每组的人数必须相同且要求每组的人数尽可能最多，一共可以分成多少组？
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">48 / 6</gadget>
<output>8</output>

<gadget id="calculator">42 / 6</gadget>
<output>7</output>

<gadget id="calculator">8 + 7</gadget>
<output>15</output>

<result>15</result>