The road width of Hongxing Road has been widened from the original 12 meters to the current 15 meters. By what percentage?
红星路的路宽由原来的12米拓宽到现在的15米，拓宽了百分之几？
<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>