project, after 6 days of joint work by teams A and B, there are still (4/7) of this project left. How many days will it take for the two teams to work together on the rest of the project?
一项工程，由甲、乙两队合做6天后，还剩下这项工程的(4/7)．两队合做剩下的工程还需要多少天？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 - (4/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(3/7) / 6</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">(4/7) / (1/14)</gadget>
<output>8</output>

<result>8</result>