There are 300 peach trees in the orchard. The number of apple trees is 80% of that of peach trees, and the number of pear trees is 4/7. How many fewer peach trees are there than pear trees?
果园里有300棵桃树，苹果树的棵树是桃树的80%，又是梨树的(4/7)，桃树比梨树少多少棵？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(4/5) / (4/7)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">300 * (7/5)</gadget>
<output>420</output>

<gadget id="calculator">420 - 300</gadget>
<output>120</output>

<result>120</result>