A novel requires typing and typesetting. Typist A needs 20 points to complete it alone, and typist B needs 30 points to complete it alone. Now that A completes (1/3) first, how many more points can the two cooperate to complete?
一篇小说要打字排版，甲打字员独自完成要20分，乙打字员独自完成要30分．现在甲先完成(1/3)后，两人合作，还要多少分可以完成？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / 30</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">(2/3) / (1/12)</gadget>
<output>8</output>

<result>8</result>