Three times a number is (6/7), what is this number?
一个数的3倍是(6/7)，这个数是多少．
<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>