road has been built for 80 meters, accounting for 1/4 of the total length. How many meters of this road are left to be repaired?
一条公路已修了80米，占全长的(1/4)，这条公路还剩多少米没有修．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">80 / (1/4)</gadget>
<output>320</output>

<gadget id="calculator">320 - 80</gadget>
<output>240</output>

<result>240</result>