There are 15 pear trees and 20 apple trees in the orchard of the school. How much more apple trees are there than pear trees?
学校的果园里有梨树15棵，苹果树20棵，苹果树的棵树比梨树多几分之几？
<gadget id="calculator">20 - 15</gadget>
<output>5</output>

<gadget id="calculator">5 / 15</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>