A cafeteria burns 5 tons of coal in March and 4.8 tons of coal in April. How much coal is saved in April compared to March?
一个食堂三月份烧煤5吨，四月份烧煤4.8吨，四月份比三月份节省用煤多少．
<gadget id="calculator">5 - 4.8</gadget>
<output>0.2</output>

<gadget id="calculator">0.2 / 5</gadget>
<output>0.04</output>

<result>0.04</result>