There are 328 peach trees in the orchard, 50 more than pear trees, and twice as many apple trees as pear trees. How many apple trees are there?
果园里有桃树328棵，比梨树多50棵，苹果树是梨树的2倍，苹果树有多少棵？
<gadget id="calculator">328 - 50</gadget>
<output>278</output>

<gadget id="calculator">278 * 2</gadget>
<output>556</output>

<result>556</result>