There are 120 apple trees in the orchard, and there are 1/3 more apple trees than pear trees. How many pear trees are there?
果园里有苹果树120棵，苹果树比梨树多(1/3)．梨树有多少棵？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">120 / (4/3)</gadget>
<output>90</output>

<result>90</result>