Hope Elementary School has carried out water conservation activities. In April, it used 46 tons of water, which is 4 tons less than in March. How much is the savings?
希望小学开展了节约用水活动，四月份用水46吨，比三月份节约用水4吨，节约了百分之几？
<gadget id="calculator">46 + 4</gadget>
<output>50</output>

<gadget id="calculator">4 / 50</gadget>
<output>2/25 = around 0.08</output>

<result>2/25 = around 0.08</result>