A section of highway can be completed by team A in 10 days and team B in 12 days. Team A practiced for 4 days first, and the rest was done by Team B alone. How many days does Team B need to repair?
一段公路，甲队独修10天完成，乙队独修12天完成．甲队先修4天后，余下的由乙队独修．乙队还要修多少天？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * 4</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">(3/5) / (1/12)</gadget>
<output>36/5 = around 7.2</output>

<result>36/5 = around 7.2</result>