The school held a rope skipping competition. Xiaowen jumps 522 times in 3 minutes, and Xiaoqiang jumps 504 times in 3 minutes. How many more times does Xiaowen jump per minute than Xiaoqiang?
学校举行跳绳比赛．小文3分钟跳522下，小强3分钟跳504下，小文比小强平均每分钟多跳多少下？
<gadget id="calculator">522 / 3</gadget>
<output>174</output>

<gadget id="calculator">504 / 3</gadget>
<output>168</output>

<gadget id="calculator">174 - 168</gadget>
<output>6</output>

<result>6</result>