A project alone takes 8 days to complete, and B alone takes 10 days to complete. If B does one day first, and A does the rest, how many days will it take?
一项工程，甲单独做要8天完成，乙单独做要10天完成．若乙先做1天，余下的由甲来做，还需多少天？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * 1</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(9/10) / (1/8)</gadget>
<output>36/5 = around 7.2</output>

<result>36/5 = around 7.2</result>