Xiaohong and three classmates wrote a total of 120 brush characters in 2 days. How many do they write each day on average?
小红和3位同学2天共写了120个毛笔字，平均每人每天写多少个？
<gadget id="calculator">120 / 2 / 4</gadget>
<output>15</output>

<result>15</result>