From April 20th to April 29th, Lin Lin finished writing a brush calligraphy book, and wrote a total of 540 brush characters. How many brush characters does he write on average every day?
林林从4月20日到4月29日把一本毛笔习字本写完，一共写了540个毛笔字，他平均每天写多少个毛笔字？
<gadget id="calculator">29 - 20</gadget>
<output>9</output>

<gadget id="calculator">9 + 1</gadget>
<output>10</output>

<gadget id="calculator">540 / 10</gadget>
<output>54</output>

<result>54</result>