In the sports group, a 170-meter long rope was cut off 20 meters to make a small skipping rope, and the rest was made into 30 big skipping ropes. How many meters is each big skipping rope?
体育组一根170米长的绳子，剪下20米做了小跳绳，剩下的做了30根大跳绳，每根大跳绳长多少米？
<gadget id="calculator">170 - 20</gadget>
<output>150</output>

<gadget id="calculator">150 / 30</gadget>
<output>5</output>

<result>5</result>