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Sarah is a marine biologist. Of the coral she observes at a dive site, 30% is healthy, 40% is unhealthy, and 30% is dead. She
Sarah is a marine biologist. Of the coral she observes at a dive site, 30% is healthy, 40% is unhealthy, and 30% is dead. She estimates that 30% of the dead coral died in the past 12 months. What percentage of the coral that she observes is dead coral that died more than 12 months ago?
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