A kind of brine is made up of salt and water at a ratio of 1:9. To prepare 180 kg of this brine, how many kg of salt is needed?
一种盐水是用盐和水按1：9配成的，要配制这种盐水180千克，需要盐多少千克？
<gadget id="calculator">1 + 9</gadget>
<output>10</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">180 * (1/10)</gadget>
<output>18</output>

<result>18</result>