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A geologist is studying a volcanic eruption that released 12,000 tons of ash into the atmosphere. If 25% of the ash settled within the first hour and 15% of the remaining ash settled in the next two hours, how many tons of ash remained airborne after five hours?
First, calculate 25% of 12,000 tons:
Next, 15% of 9,000 tons settled in the next two hours:
A plant biologist modifies a drought-resistant crop strain that yields 30% more than conventional crops. If a conventional field yields 5.4 tons per hectare, and a 15-hectare modified field is planted, what is the total yield of the modified field?
A plant biologist introduces a gene into wheat that reduces water loss by 40%. If unmodified wheat loses 2.5 liters of water per day through transpiration, how much water does a modified field of 8 hectares save in one day?
Daily water loss for unmodified crop per hectare = 2.5 L
But 7,200 years is much less — contradiction.
The 7,200 years is negligible; observed decay contradicts large age. But question asks to validate the logic: it does not. However, based on percentage alone:
Total saved = 225,000 + 337,500 = 562,500 L
First 24 hours: 40% of 18,000 = 7,200 tons dispersed