There are 120 peach trees in the orchard, 18 fewer than twice as many apple trees. How many apple trees are there? (column equation)
果园里有桃树120棵，比苹果树的2倍还少18棵，苹果树有多少棵？(列方程)
<gadget id="calculator">120 + 18</gadget>
<output>138</output>

<gadget id="calculator">138 / 2</gadget>
<output>69</output>

<result>69</result>