For a project, A will do it for 3 days first, and B will do it for another 5 days to complete (1/4) of the project. A will do it for 2 more days to complete the remaining (1/6) of the project. How many days will this project take?
一项工程，甲先做3天，乙再做5天，完成这项工程的(1/4)，甲再做2天，完成余下工程的(1/6)，最后再由乙做，完成这项工程还要多少天．
<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">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(3/4) * (1/6)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/4) - (1/8)</gadget>
<output>5/8 = around 0.625</output>

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

<gadget id="calculator">(3/4) * (1/12) * 3</gadget>
<output>3/16 = around 0.1875</output>

<gadget id="calculator">(1/4) - (3/16)</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">(1/16) / 5</gadget>
<output>1/80 = around 0.0125</output>

<gadget id="calculator">(5/8) / (1/80)</gadget>
<output>50</output>

<result>50</result>