pile of chemical fertilizer weighs (5/6) tons, if (2/3) of it is used, how many tons are used?
一堆化肥重(5/6)吨，用去它的(2/3)，用去多少吨？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(5/6) * (2/3)</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>