Working alone on a certain project, team A needs 100 days to complete, and team B needs 150 days to complete. After teams A and B work together for 50 days, how many days will it take for team B to do the rest of the project?
单独干某项工程，甲队需100天完成，乙队需150天完成．甲，乙两队合干50天后，剩下的工程乙队干还需多少天．
<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">(1/60) * 50</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>