36 trees were planted in the fifth grade, 4 trees less than twice as many as in the fourth grade. How many trees to plant in fourth grade
五年级种树36棵，比四年级种的2倍少4棵．四年级种树多少棵
<gadget id="calculator">36 + 4</gadget>
<output>40</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<result>20</result>