To build a concrete road, team A needs 12 days to complete it alone, and team B needs 15 days to complete it alone. Team B will do the whole process first (1/10), and the rest will be done by A and B together. How many days will be left? Can it be finished?
修筑一条水泥路，甲队独修需12天完成，乙队独修需15天完成，乙队先做全程的(1/10)，剩下的由甲、乙合做，还要多少天就能完工？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

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

<gadget id="calculator">(1/12) + (1/15)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(9/10) / (3/20)</gadget>
<output>6</output>

<result>6</result>