If 5 kg of coal can generate 10 kWh of electricity, how many kg of coal is needed to generate 1 kWh of electricity?
如果5千克煤可发电10度，那么发一度电需要煤多少千克
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>