A project can be completed by team A alone in 10 days, and the work efficiency of team B is 2/3 of that of A. Now that the two teams are working together, how many days will it take to complete the project?
一项工程，甲队独做10天完成，乙队的工效是甲的(2/3)．现两队合做，几天能完成这项工程？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(1/10) * (2/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) + (1/10)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / (1/6)</gadget>
<output>6</output>

<result>6</result>