To build a road, it takes 100 days for engineering team A to complete it alone, and 150 days for engineering team B to complete it alone. After 50 days of joint construction by engineering team A and B, team B will do the rest of the project alone. How many days will it take to complete the project? ．
修一条公路，甲工程队独做需100天完成，乙工程队独做需150天完成，甲、乙两工程队合修50天后，余下的工程由乙队单独做，还需多少天才能完成．
<gadget id="calculator">1 / 100</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">1 / 150</gadget>
<output>1/150 = around 0.006667</output>

<gadget id="calculator">(1/100) + (1/150)</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">50 * (1/60)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) / (1/150)</gadget>
<output>25</output>

<result>25</result>