For tree planting activities in spring, the first group planted 256 trees, 20 trees less than three times the number of trees planted in the second group. How many trees were planted in the second group?
春季植树活动，第一组植树256棵，比第二组植树棵数的3倍少20棵，第二组植树多少棵？
<gadget id="calculator">20 + 256</gadget>
<output>276</output>

<gadget id="calculator">276 / 3</gadget>
<output>92</output>

<result>92</result>