7a
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7a 7a * 4 = 28a 7a * 7b = 49ab
A 30A bra size is larger than a 28A. The number indicates the band size, with a larger number corresponding to a wider band. Both sizes have the same cup volume (A), but the 30A will have a looser fit around the ribcage compared to the 28A.
Fourteen year old girls may all have different sizes of bras. It may be any size, from 28A to 42D.