In Yongle Township, a 1,200-meter-long canal was built in three weeks. In the first and second weeks, 2/3 of the full length was built. In the second and third weeks, a total of 700 meters was built. How many meters were built in the second week?
永乐乡三周修完一条1200米长的水渠，第一、二周修了全长的(2/3)，第二、三周共修700米，第二周修了多少米？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1_200 * (2/3)</gadget>
<output>800</output>

<gadget id="calculator">700 - 1_200</gadget>
<output>-500</output>

<gadget id="calculator">800 + (-500)</gadget>
<output>300</output>

<result>300</result>