The school cafeteria burned 1.5 tons of coal in May, saving 0.3 tons of coal compared with April, and how many percent was saved compared with April?
学校食堂5月份烧煤1.5吨，比4月份节约用煤0.3吨，比4月份节约了百分之几？
<gadget id="calculator">1.5 + 0.3</gadget>
<output>1.8</output>

<gadget id="calculator">0.3 / 1.8</gadget>
<output>0.166667</output>

<result>0.166667</result>