It will take 63 days for a project to be done by team A alone, and then it will take 28 days for team B to do it alone; if the two teams work together, it will take 48 days; if team A will do it alone, how many days will it take?
一项工程由甲队独做63天后再由乙队独做还需要28天；如果两队合做要48天；如果由甲队独做要多少天？
<gadget id="calculator">28 / 48</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">1 - (7/12)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">63 - 28</gadget>
<output>35</output>

<gadget id="calculator">(5/12) / 35</gadget>
<output>1/84 = around 0.011905</output>

<gadget id="calculator">1 / (1/84)</gadget>
<output>84</output>

<result>84</result>