Xiaohua and Xiaofang wrote a total of 120 brush characters in 4 days. How many do they write each day on average?
小华和小芳，4天共写了120个毛笔字，平均每人每天写多少个？
<gadget id="calculator">120 / 4 / 2</gadget>
<output>15</output>

<result>15</result>