Lili wrote brush characters. She planned to write 15 words a day, but actually wrote 5 more words a day. As a result, she completed the task 2 days ahead of schedule. How many brush characters does Lili have to write?
丽丽写毛笔字，计划每天写15个，实际每天多写5个，结果提前2天完成任务．丽丽共要写多少个毛笔字？
<gadget id="calculator">15 + 5</gadget>
<output>20</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">15 * (2/5)</gadget>
<output>6</output>

<gadget id="calculator">20 * 6</gadget>
<output>120</output>

<result>120</result>