There are 310 pear trees and 410 apple trees in the orchard, which are equivalent to (8/9) of all fruit trees. How many fruit trees are there in the orchard?
果园有梨树310棵，苹果树410棵，这两种树相当于所有果树棵树的(8/9)．果园里一共有多少棵果树？
<gadget id="calculator">310 + 410</gadget>
<output>720</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">720 / (8/9)</gadget>
<output>810</output>

<result>810</result>