An empty container weighs 5% of its total weight when fully filled. If a partially filled container weighs two-fifths of the total weight when fully filled, what fraction of the container is filled?
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radio_button_unchecked(A) 1/3
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radio_button_unchecked(B) 7/19
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radio_button_unchecked(C) 2/5
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radio_button_unchecked(D) 5/8
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radio_button_unchecked(E) 7/8