Arbor Day is here. There are 37 boys and 23 girls in Class 4 and 1. They plant trees in groups of 4. How many groups can they be divided into on average?
植树节到了，四1班有男生37人，女生23人，按每4人一组去植树，平均可以分成几组？
<gadget id="calculator">37 + 23</gadget>
<output>60</output>

<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<result>15</result>