The school bought 144 meters of plastic rope, and made 5 skipping ropes every 9 meters. According to this calculation, how many more can be made? (Solve with ratio)
学校买来144米塑料绳，每9米做5根跳绳，照这样计算，剩下的还能做多少根？(用比例解)
<gadget id="calculator">144 - 9</gadget>
<output>135</output>

<gadget id="calculator">135 * 5</gadget>
<output>675</output>

<gadget id="calculator">675 / 9</gadget>
<output>75</output>

<result>75</result>