Divide (6/7) meters of rope into 3 parts on average, each part occupies ((())/(())), how many meters is each part long.
把(6/7)米绳子平均分成3份，每份占((())/(()))，每份长多少米．
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">(6/7) / 3</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>