A factory used 800 tons of water in May and 1,000 tons of water in June. How much less water was used in May than in June?
某工厂五月份用水800吨，六月份用水1000吨，五月份用水比六月份少用水百分之几？
<gadget id="calculator">1_000 - 800</gadget>
<output>200</output>

<gadget id="calculator">200 / 1_000</gadget>
<output>1/5 = around 0.2</output>

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