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A math problem ~ who told me how to correct it ~ ~
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10 divided by 0.4 is how many kilograms of seawater are needed per kilogram of salt.

Divide 8 kilograms of seawater by this quotient, that is, how many kilograms of salt can be produced according to how many such figures there are in 8 thousand Kerry.

Understanding of standardized application.

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I'll tell you another trick: when you encounter this kind of multiple-choice question in the future, count the answers of other options. If the answer is the same as A's, then you can understand it by scrutinizing its quantitative relationship.