A project requires 20 days for A to complete, and 30 days for B to do it. The two work together. A rests for 2.5 days. This project takes 14 days. Ask how many days B has rested.
一项工程，甲做需20天，乙做需30天，两人合做，甲休息了2.5天，此工程共用14天，问乙休息了多少天．
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">14 - 2.5</gadget>
<output>11.5</output>

<gadget id="calculator">(1/20) * 11.5</gadget>
<output>0.575</output>

<gadget id="calculator">1 - 0.575</gadget>
<output>0.425</output>

<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">0.425 / (1/30)</gadget>
<output>12.75</output>

<gadget id="calculator">14 - 12.75</gadget>
<output>1.25</output>

<result>1.25</result>