There is a basket of 72 kilograms of apples, (1/6) of it is eaten on the first day, and (5/9) of it is eaten on the second day. What fraction is left?
有一筐72千克的苹果，第一天吃了它的(1/6)，第二天吃了它的(5/9)．还剩下几分之几？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 - (1/6) - (5/9)</gadget>
<output>5/18 = around 0.277778</output>

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