Xiao Ming can write 9 big characters per minute. He wrote from 7:15 pm to 7:50 pm. How many big characters did he write in total?
小明每分钟可写9个大字，他从晚上7时15分写道7时50分，共写了多少个大字？
<gadget id="calculator">9 * 35</gadget>
<output>315</output>

<result>315</result>