If 30 kilograms of coal can generate 12 degrees of electricity, how many degrees can be generated on average per kilogram of coal? (expressed in simplified form)
如果30千克煤可发电12度，那么平均每千克煤可发电多少度？(用最简分数表示)
<gadget id="calculator">12 / 30</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>