To build a 300-meter-long canal, the total number (2/5) will be repaired on the first day, and the remaining (1/6) will be repaired on the second day. How many meters are left to be repaired?
修一条300米长的水渠，第一天修总数的(2/5)，第二天修余下的(1/6)，还余多少米没修？
<gadget id="calculator">2 / 5</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 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">300 * (3/5) * (1/6)</gadget>
<output>30</output>

<result>30</result>