Answer:
A
Explanation:
You want to know which ball weighs 30 g if balls A, B, C, D, E weigh 30, 50, 50, 50, 80 grams.
Correspondence
The given information does not say what the correspondence is between weights and ball designators. If we assume the given order is the same for designators as for weights, then the first letter corresponds to the first weight, and ...
Ball A weighs 30 g.
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Additional comment
If there's more to the question, you'd have to use that additional information to decide.
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