There is 2,000 kilograms of salt water with a water content of 90%. After drying for a period of time, the water content is measured to be less than the original (1/9). How much is the weight of the salt water at this time?
有含水量为90%的盐水2000千克，晒了一段时间后，测得含水量比原来少了(1/9)，这时盐水的重量是多少千克？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">2_000 * (1/10)</gadget>
<output>200</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 - (1/9)</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">2_000 * (9/10) * (8/9)</gadget>
<output>1_600</output>

<gadget id="calculator">200 + 1_600</gadget>
<output>1_800</output>

<result>1_800</result>