A school uses 600 kwh of electricity in May, how much kwh does it use in June? If 600/(1-20%) is used for calculation, the supplementary condition is how much less electricity is used in May than in June
某学校五月份用电600度，，六月份用电多少度？如果用600/(1-20%)计算，应补充的条件是五月份比六月份少用电多少
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>