If a project is done separately, A will take 8 days and B will take 10 days. A and B cooperate, and A takes a day off due to illness. How many days will it take to complete this task?
一件工程，若单独做，甲要用8天，乙要用10天．甲乙合作，甲因病休息一天，完成这项任务共用多少天？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) + 1</gadget>
<output>9/8 = around 1.125</output>

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

<gadget id="calculator">(1/10) + (1/8)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">(9/8) / (9/40)</gadget>
<output>5</output>

<result>5</result>