The students planted trees. The fifth grade planted 105 trees, 5 trees less than twice as many as the fourth grade. How many trees were planted in the fourth grade?
同学们植树，五年级种了105棵，比四年级的2倍少5棵，四年级种了多少棵？
<gadget id="calculator">105 + 5</gadget>
<output>110</output>

<gadget id="calculator">110 / 2</gadget>
<output>55</output>

<result>55</result>