A greening team planted 240 camphor trees beside the road, 20 fewer than four times the number of ginkgo trees. How many ginkgo trees are there?
一个绿化小队，在公路旁种了240棵香樟树，比银杏树的4倍少20棵．银杏树有多少棵．
<gadget id="calculator">240 + 20</gadget>
<output>260</output>

<gadget id="calculator">260 / 4</gadget>
<output>65</output>

<result>65</result>