Uncle Wang’s family bought 2 tons of coal and planned to burn it for 160 days. Due to the improvement of the stove, 2.5 kilograms can be saved every day. How many days can this batch of coal be burned?
王大爷家买来2吨煤，计划烧160天，由于改进炉灶，每天节省2.5千克，这批煤可以烧多少天？
<gadget id="calculator">2 * 1_000</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 / 160</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">(25/2) - 2.5</gadget>
<output>10</output>

<gadget id="calculator">2_000 / 10</gadget>
<output>200</output>

<result>200</result>