Dig a canal, the full length (1/4) has been repaired, and then dig another 25 meters. At this time, the ratio of dug to undug is 1:2. How many meters is the total length of this canal?
挖一条水渠，已修了全长的(1/4)，再挖25米，这时已挖与未挖的比是1：2，这条水渠全长多少米？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/3) - (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">25 / (1/12)</gadget>
<output>300</output>

<result>300</result>