The number of pear trees is three times that of peach trees, the number of peach trees is 48, and the number of apple trees is twice that of pear trees. How many apple trees are there?
梨树的棵数是桃树的3倍，桃树48棵，苹果树的棵数是梨树2倍，苹果树有多少棵？
<gadget id="calculator">48 * 3 * 2</gadget>
<output>288</output>

<result>288</result>