To build a road with a length of 1200 meters, the ratio of the road that has been repaired to the one that has not been repaired is 3:5. How many meters have been repaired?
修一条长1200米的公路，已经修的与未修的比是3：5．已经修了多少米？
<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">1_200 * (3/8)</gadget>
<output>450</output>

<result>450</result>