There are 120 fewer pear trees than apple trees in the orchard, and there are 2/5 as many pear trees as apples. How many apple trees are there?
果园里的梨树比苹果树少120棵，其中梨树是苹果数的(2/5)，苹果树有多少？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">120 / (3/5)</gadget>
<output>200</output>

<result>200</result>