The Shanghai World Expo uses a large number of LED energy-saving lamps. A 40W incandescent lamp consumes about (1/25) kWh per hour, and energy-saving lamps consume (1/5) of its power consumption. The incandescent lamp uses 5 hours of electricity to save energy. How many hours can the lamp be used.
上海世博会大量采用led节能灯，一盏40W的白炽灯每小时耗电约是(1/25)度，节能灯的耗电量是它的(1/5)，白炽灯使用5小时的电量节能灯可以使用多少小时．
<gadget id="calculator">1 / 25</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">(1/25) * 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/25) * (1/5)</gadget>
<output>1/125 = around 0.008</output>

<gadget id="calculator">(1/5) / (1/125)</gadget>
<output>25</output>

<result>25</result>