A project can be completed in 24 days by the cooperation of A and B. Now A works in 6 days first, and B continues in 4 days, which just completes (1/5) of the whole project. If B does it alone, how many days can he complete the project?
一项工程，甲、乙二人合作24天可以完工，现在甲先做6天，乙接着做4天，正好完成了全部工程的(1/5)．若乙单独做，多少天可以完成这项工程？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 24</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">(1/24) * 4</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/5) - (1/6)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">(1/30) / 2</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">1 / (1/60)</gadget>
<output>60</output>

<result>60</result>