Divide 120 boys and 140 girls into several groups. It is required that each group has the same number of boys and the same number of girls. What is the maximum number of groups that can be divided into?
将120名男生和140名女生分成若干小组，要求每组男生的人数相同，女生的人数也相同，则最多可以分成多少组．
<gadget id="calculator">2 * 2 * 5</gadget>
<output>20</output>

<result>20</result>