There are 18 cypress trees and 5 oak trees in the school. What fraction are there oak trees compared to cypress trees?
学校有柏树18棵，橡树5棵．橡树的棵数是柏树的几分之几？
<gadget id="calculator">5 / 18</gadget>
<output>5/18 = around 0.277778</output>

<result>5/18 = around 0.277778</result>