Xiaoming's family has 81 kilograms of rice, and now they have eaten (3/9), how many kilograms are left?
小明家有大米81千克，现在吃掉了(3/9)，还剩多少千克？
<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">81 * (2/3)</gadget>
<output>54</output>

<result>54</result>