There are 4 liters of water in the jug, how many milliliters of water is left after filling 9 cups with a capacity of 225 milliliters.
水壶里有4升的水，倒满9个容量为225毫升的杯子后，还剩下多少毫升的水．
<gadget id="calculator">4 * 1_000</gadget>
<output>4_000</output>

<gadget id="calculator">9 * 225</gadget>
<output>2_025</output>

<gadget id="calculator">4_000 - 2_025</gadget>
<output>1_975</output>

<result>1_975</result>