30 kg reduces its (1/6), which is how many kg is reduced
30千克减少了它的(1/6)，就是减少了多少千克
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">30 * (1/6)</gadget>
<output>5</output>

<result>5</result>