bag of flour weighs 90 kilograms, if (5/6) of it is used up, how many kilograms are left?
一袋面粉重90千克，用去了它的(5/6)，还剩下多少千克？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">90 * (1/6)</gadget>
<output>15</output>

<result>15</result>