To build a section of 1200m highway, the full length (1/12) can be repaired every day, and the full length can be repaired in 4 days ((())/(())). How much m is the total repaired in 4 days?
修一段1200m的公路，每天修全长的(1/12)，4天可以修全长的((())/(()))，4天共修了多少m．
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1_200 * (1/12) * 4</gadget>
<output>400</output>

<result>400</result>