A job can be completed in 20 days by A alone, and 30 days by B alone. Now two people work together to complete the job in 16 days. It is known that A rested for 2 days and B rested for 16 days. several days. May I ask: How many days did B rest?
一项工作，甲单独做20天可以完成，乙单独做30天可以完成，现在两人合做，用16天就完成了工作，已知在这16天中甲休息了2天，乙休息了若干天．请问：乙休息了多少天？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">16 - 2</gadget>
<output>14</output>

<gadget id="calculator">(1/20) * 14</gadget>
<output>7/10 = around 0.7</output>

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

<gadget id="calculator">(1/30) * 16</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">(8/15) - 1</gadget>
<output>-7/15 = around -0.466667</output>

<gadget id="calculator">(7/10) + (-7/15)</gadget>
<output>7/30 = around 0.233333</output>

<gadget id="calculator">(7/30) / (1/30)</gadget>
<output>7</output>

<result>7</result>