A section of road with a length of 80 meters is built, and the rest (3/5) is repaired. How many meters have been repaired?
修一段长80米的公路，修了的是剩下的(3/5)，修了多少米．
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">80 * (3/8)</gadget>
<output>30</output>

<result>30</result>