Xiaohong practiced writing big characters. She wrote 26 on the first day, 18 on the second day, and 31 on the third day. How many big characters does she write on average every day?
小红练习写大字，第一天写了26个，第二天写了18个，第三天写了31个，她平均每天写几个大字？
<gadget id="calculator">26 + 18 + 31</gadget>
<output>75</output>

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

<result>25</result>