The power plant plans to use 2,500 tons of coal in 20 days, but the actual daily consumption is 25 tons less than the plan. How many days are these coals actually usable?
发电厂计划20天用煤2500吨，实际每天比计划少用25吨．这些煤实际可用多少天？
<gadget id="calculator">2_500 / 20</gadget>
<output>125</output>

<gadget id="calculator">125 - 25</gadget>
<output>100</output>

<gadget id="calculator">2_500 / 100</gadget>
<output>25</output>

<result>25</result>