There are 39 more peach trees than apricot trees in the orchard, and the number of apricot trees is 70% of that of peach trees. How many peach trees are there?
果园里的桃树比杏树多39棵，杏树的棵数是桃树的70%，桃树有多少棵？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">39 / (3/10)</gadget>
<output>130</output>

<result>130</result>