The road repair team repaired a 600-meter-long road. On the first day, 20% of the total length was repaired. How many meters will be repaired on the second day to repair exactly half of the total length?
修路队修一条长600米的路，第一天修了全长的20%，第二天再修多少米就正好修完全长的一半？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/2) - (1/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">600 * (3/10)</gadget>
<output>180</output>

<result>180</result>