A project needs 15 days to complete, how many days will A need to complete the work (2/3).
一项工程，甲需15天完成，甲要多少天完成这项工作的(2/3)．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(2/3) / (1/15)</gadget>
<output>10</output>

<result>10</result>