A factory used 60 tons of coal in June, and it used 25% less coal in June than in May. How many tons of coal was used in May?
某工厂六月份用煤60吨，六月份比五月份少用煤二成五，五月份用煤多少吨？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">60 / (3/4)</gadget>
<output>80</output>

<result>80</result>