There are apple trees, peach trees, and pear trees in an orchard. (1/2) of apple trees is equal to (1/3) of peach trees, and (3/7) of pear trees. It is known that there are more pear trees than apple trees 120 trees. How many peach trees are there?
一个果园里有苹果树、桃树、梨树，苹果树的(1/2)等于桃树的(1/3)，等于梨树的(3/7)，已知梨树比苹果树多了120棵．桃树有多少棵．
<gadget id="calculator">7 - 6</gadget>
<output>1</output>

<gadget id="calculator">120 / 1</gadget>
<output>120</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">120 * 3 * 3</gadget>
<output>1_080</output>

<result>1_080</result>