For a project, A will do it for 2 days first, then B will do it for 3 days to complete (1/4) of the whole project, A will do it for 3 more days to complete the remaining (1/4) of the project, then B will do it again, and B will finish it How many days will this work take?
一项工程，甲先做2天，乙再做3天，完成全工程的(1/4)，甲再做3天，完成余下工程的(1/4)，最后再由乙做，乙完成这件工作还需要几天？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) * (1/4)</gadget>
<output>3/16 = around 0.1875</output>

<gadget id="calculator">1 - (1/4) - (3/16)</gadget>
<output>9/16 = around 0.5625</output>

<gadget id="calculator">(1/4) / 3</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">2 * (3/4) * (1/12)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/4) - (1/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) / 3</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">(9/16) / (1/24)</gadget>
<output>27/2 = around 13.5</output>

<result>27/2 = around 13.5</result>