A 60-meter-long rope takes 12 meters to make a skipping rope and 30 meters to repair a volleyball net. How many meters is missing from this rope?
一根60米长的绳子，做跳绳用去12米，修排球网用去30米，这根绳子少了多少米？
<gadget id="calculator">12 + 30</gadget>
<output>42</output>

<result>42</result>