It takes 8 days for A and B to complete a project together. If A alone completes (1/10) of the project every day, how much does B need to do alone?
一项工程，甲、乙合做需8天完成，甲独做每天完成这项工程的(1/10)，乙独做需多少．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

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

<gadget id="calculator">(1/8) - (1/10)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">1 / (1/40)</gadget>
<output>40</output>

<result>40</result>