The school bought 252 meters of rope, and every 9 meters can make 5 skipping ropes. According to this calculation, how many skipping ropes can be made in total? (Solve with ratio)
学校买252米绳子，每9米能做5根跳绳，照这样计算，一共能做多少根跳绳？(用比例解)
<gadget id="calculator">9 / 5</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">252 / (9/5)</gadget>
<output>140</output>

<result>140</result>