Teacher Wang wants to buy a football and 4 skipping ropes for 50 yuan, and each football is 38 yuan. How much is each skipping rope?
王老师要买一个足球和4根跳绳共用50元，每个足球38元，每根跳绳多少元？
<gadget id="calculator">50 - 38</gadget>
<output>12</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<result>3</result>