There are 420 more apple trees than pear trees in the orchard, and there are 3/5 as many pear trees as there are apple trees (3/5), how many apple trees are there?
果园里苹果树比梨树多420棵，梨树的棵树是苹果树的(3/5)，苹果树有多少棵？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">420 / (2/5)</gadget>
<output>1_050</output>

<result>1_050</result>