There are 15 pear trees and 20 apple trees in the school's orchard. How many fractions are there fewer pear trees than apple trees?
学校的果园里有梨树15棵，苹果树20棵．梨树的棵数比苹果树少几分之几？
<gadget id="calculator">20 - 15</gadget>
<output>5</output>

<gadget id="calculator">5 / 20</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>