Xiaohua and his two classmates wrote a total of 120 brush characters in 4 days. How many do they write each day on average?
小华和他的2个同学4天共写了120个毛笔字，平均每人每天写多少个？
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">120 / 4 / 3</gadget>
<output>10</output>

<result>10</result>