The third-grade students of Jincheng Primary School went to work in the "Practice Center". There were 156 girls and 128 boys. They were divided into groups of 4. How many groups can they be divided into?
金成小学三年级学生去"实践中心"劳动，女生去了156人，男生去了128人，4人分一组，一共可以分多少组？
<gadget id="calculator">156 + 128</gadget>
<output>284</output>

<gadget id="calculator">284 / 4</gadget>
<output>71</output>

<result>71</result>