Last year there were 600 pear and peach trees in the orchard, of which pear trees accounted for 40% of the total. This year, some peach trees were planted, but the number of pear trees remained unchanged. At this time, pear trees accounted for 30% of the total. How many peach and pear trees are there this year?
去年果园里有梨树和桃树共600棵，其中梨树占总数的40%．今年又种了一些桃树，梨树的棵树不变，这时梨树占总数的30%．今年桃树和梨树一共有多少棵．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(2/5) / (3/10)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">600 * (4/3)</gadget>
<output>800</output>

<result>800</result>