The 6-ton (4/9) weighs as much as the 8-ton one.
6吨的(4/9)与8吨的多少一样重．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(4/9) / 8</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">6 * (1/18)</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>