There are 207 apple trees in the orchard, and the number of pear trees is three times that of apple trees. How many pear trees are there?
果园里有207棵苹果树，梨树的棵数是苹果树的3倍，梨树有多少棵．
<gadget id="calculator">207 * 3</gadget>
<output>621</output>

<result>621</result>