How many kilograms is (1/2) of (6/7) kilograms?
(6/7)千克的(1/2)是多少千克．
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(6/7) * (1/2)</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>