There are 300 apricot trees in the orchard, and the number of peach trees is 30 less than twice the number of apricot trees. How many peach trees are there in total?
果园里有杏树300棵，桃树的棵数比杏树的2倍少30棵，桃树共有多少棵？
<gadget id="calculator">300 * 2</gadget>
<output>600</output>

<gadget id="calculator">600 - 30</gadget>
<output>570</output>

<result>570</result>