The school sells a 16-meter-long rope. After cutting 9 skipping ropes of the same length, there are 2.5 meters left. How long is each skipping rope on average? (Solve first with arithmetic, then with equations)
学校卖一根16米长的绳子，剪下9根同样长的跳绳后，还剩2.5米，平均每根跳绳长几米？(先用算术方法解，再用方程解)
<gadget id="calculator">16 - 2.5</gadget>
<output>13.5</output>

<gadget id="calculator">13.5 / 9</gadget>
<output>1.5</output>

<result>1.5</result>