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Home » \[ (2a + b) - (a + b) = 6 - 5 \] - Groen Casting

\[ (2a + b) - (a + b) = 6 - 5 \] - Groen Casting

📅 March 1, 2026 👤 scraface

Mar 01, 2026

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📌 #### 4995000

📌 A micropaleontologist observes that the ratio of two microfossil species, A and B, shifts from 3:7 in pre-industrial to 7:5 in modern sediment. If a sample contains 840 microfossils, how many more of species B are present now compared to pre-industrial levels?

📌 Pre-industrial: Species B = (7/10) × 840 = <<7/10*840=588>>588.

📌 Modern: Species B = (5/12) × 840 = <<5/12*840=350>>350? Wait — 7:5 → B is 5 parts → (5/12)×840 = <<5/12*840=350>>350.

📌 Wait — this suggests fewer B now, but that contradicts the context. Recheck: maybe ratio means B is larger now? But 7:5 → B is 5/12 ≈ 41.7%, pre-industrial 70% — so B decreased? But the question says how many more — possibly implies increase.

📌 Wait — correction: 7:5 → total parts = 12 → B = 5/12 ≈ 41.7%. Pre-industrial was 7:7 → 70%. So B decreased, but let's proceed numerically.

📌 Pre-industrial B: (7/10)×840 = <<7/10*840=588>>588

📌 Modern B: (5/12)×840 = (840 ÷ 4)×(5/3) = 210×(5/3) = <<210*5/3=350>>350

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