Alternative interpretation: perhaps the ratio indicates abundance, and shifts to 7:5 means B becomes 5 parts, A becomes 7, so total 12 — B fraction 5/12.

February 22, 2026

$Alternative interpretation: perhaps the ratio indicates abundance, and shifts to 7:5 means B becomes 5 parts, A becomes 7, so total 12 — B fraction 5/12.$

Difference = Modern B – Pre-industrial B = 350 – 588 = –238
But since the question asks how many more, and it’s less, the answer is that 238 fewer, but we must give the number as per calculation.
However, in the context of the sample problems, likely a ratio error in interpretation.
Pre-industrial 3:7 = 3:7 — B = 7/(3+7) = 0.7
Modern = 5/(7+5) = 5/12 ≈ 0.4167
So B decreased by 0.7 – 0.4167 = 0.2833 of total

Alternative interpretation: perhaps the ratio indicates abundance, and shifts to 7:5 means B becomes 5 parts, A becomes 7, so total 12 — B fraction 5/12.

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