The actual power consumption of the school in April was 180 kWh, which was (2/5) less than the plan. How much kWh did the school actually save in electricity consumption in April compared to the plan?
学校四月份实际用电180千瓦时，比计划节约了(2/5)．学校四月份实际比计划节约用电多少千瓦时？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">180 / (3/5)</gadget>
<output>300</output>

<gadget id="calculator">300 - 180</gadget>
<output>120</output>

<result>120</result>