★★One piece of cloth, Master Wang used it to make clothes (2/5), and the rest was used by Master Zhang. Master Zhang used up (1/3) on the first day, how much is left?
★★一块布，王师傅做衣服用去了(2/5)，剩下的给张师傅用．张师傅第一天就用去(1/3)，还剩几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">1 - (2/5) - (1/3)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>