There are 200 peach trees, pear trees, and apple trees in the orchard. The number of peach trees is three times that of pear trees, and the number of apple trees is twice that of peach trees. How many apple trees are there?
果园里有桃树、梨树和苹果树共200棵，桃树是梨树的3倍，苹果树是桃树的2倍，苹果树有多少棵．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">1 + 3 + 6</gadget>
<output>10</output>

<gadget id="calculator">200 / 10</gadget>
<output>20</output>

<gadget id="calculator">20 * 6</gadget>
<output>120</output>

<result>120</result>