Xiao Pang and Xiao Ding Ding had a typing competition. They started at 9:45 and ended at 10:00. Xiao Pang typed a total of 750 characters, and Xiao Ding Ding typed a total of 975 words. Xiao Ding Ding typed a few more words per minute than Xiao Pang words?
小胖和小丁丁进行打字比赛，他们从9：45开始到10：00结束，小胖一共打了750个字，小丁丁一共打了975个字，小丁丁比小胖平均每分钟多打几个字？
<gadget id="calculator">975 / 15</gadget>
<output>65</output>

<gadget id="calculator">750 / 15</gadget>
<output>50</output>

<gadget id="calculator">65 - 50</gadget>
<output>15</output>

<result>15</result>