A can complete a project alone in 18 days. If A and B work together, half of the project can be completed in 6 days. How many days will it take for Party B to complete the project alone?
甲做一项工程用18天就能单独完成，如果甲乙双方一起做，用6天就能完成工程的一半．乙方单独完成工程的话用多少天才能完成？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) / 6</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / 18</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">(1/12) - (1/18)</gadget>
<output>1/36 = around 0.027778</output>

<gadget id="calculator">1 / (1/36)</gadget>
<output>36</output>

<result>36</result>