The salinity rate of seawater is 0.3%, and 1.23 tons of salt needs to be dried. How many tons of seawater should be poured into the salt pan at least?
海水的含盐率是0.3%，要晒盐1.23吨，盐田要至少灌入海水多少吨？
<gadget id="calculator">0.3 / 100</gadget>
<output>0.003</output>

<gadget id="calculator">1.23 / 0.003</gadget>
<output>410</output>

<result>410</result>