Two teams, A and B, are working together to dig a canal. It is known that the work efficiency of team B is (2/3) that of team A. If team A alone can complete the work in 20 days, how many days can the two teams work together to complete the project?
甲乙两队合挖一条水渠，已知乙队的工效是甲队的工效的(2/3)，若甲队独挖20天可完成，那么两队合挖多少天可以完工？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

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

<gadget id="calculator">(1/20) * (2/3)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/20) + (1/30)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / (1/12)</gadget>
<output>12</output>

<result>12</result>