There is 12.6kg of gasoline, use up (1/6), how many kilograms are left.
有12.6kg汽油，用去(1/6)，剩下多少kg．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">12.6 * (5/6)</gadget>
<output>10.5</output>

<result>10.5</result>