A project is completed in 4 days by A alone, 7 days by B alone, 2 days by A alone, and 3 days by B alone. The total ((())/(())) of this project is completed.
一项工程甲独作4天完成，乙独作7天完成，甲独作2天完成，乙独作3天完成，共完成了这项工程的((())/(()))．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/7) * 3</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(1/2) + (3/7)</gadget>
<output>13/14 = around 0.928571</output>

<result>13/14 = around 0.928571</result>