A salt farm uses seawater to dry salt, and 100 grams of seawater can dry 18 grams of salt. Now it needs to dry 3,600 tons of salt. How many tons of seawater is needed?
某晒盐场用海水晒盐，用100克海水可晒盐18克，现要晒盐3600吨，需这样的海水多少吨？
<gadget id="calculator">18 / 100</gadget>
<output>9/50 = around 0.18</output>

<gadget id="calculator">3_600 / (9/50)</gadget>
<output>20_000</output>

<result>20_000</result>