There are 80 skipping ropes in the school gym room, 23 are lent to class 1 of the second grade, and 30 are borrowed to class 2 of the second grade. How many skip ropes are left in the school gym room?
学校体育室有80根跳绳，借给二年级1班23根，二年级2班30根，学校体育室还剩多少根跳绳？
<gadget id="calculator">80 - 23 - 30</gadget>
<output>27</output>

<result>27</result>