Wang Fang had to write 100 big characters. After 3 days of writing, there were 25 left. How many big characters did she write on average?
王芳要写100个大字，写了3天，还剩25个，她平均写几个大字？
<gadget id="calculator">100 - 25</gadget>
<output>75</output>

<gadget id="calculator">75 / 3</gadget>
<output>25</output>

<result>25</result>