The school bought 135 meters of plastic rope, and every 9 meters can be used to make 5 skipping ropes. According to this calculation, how many skipping ropes can be made with these ropes?
学校买来塑料绳135米，每9米能做5根跳绳，照这样计算，这些绳子可以做多少根跳绳？
<gadget id="calculator">9 / 5</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">135 / (9/5)</gadget>
<output>75</output>

<result>75</result>