An energy-saving lamp consumes (3/250) kilowatt-hours of electricity in one hour, which is only (1/5) of ordinary incandescent lamps. After installing energy-saving lamps in the school guard room, the monthly electricity consumption is about (6/5) kWh. How many kilowatt-hours of electricity will be used per month if ordinary incandescent lamps are used?
一只节能灯1小时耗电(3/250)千瓦时，只有普通白炽灯的(1/5)．学校门卫室安装节能灯后每月用电量约为(6/5)千瓦时．如果用普通白炽灯每个月要用电多少千瓦时？
<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(6/5) / (4/5)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>