A packet of flour weighs (2/3) kg, if (1/3) of it is eaten, how many kg are left?
一包面粉重(2/3)kg，吃了它的(1/3)，剩下多少kg．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 3</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">(2/3) * (2/3)</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>