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Edna puts 250L of 48oC water into the bathtub by turning on only the hot water...

Edna puts 250L of 48oC water into the bathtub by turning on only the hot water faucet.

She then adds more water by turning on only the cold water faucet (water at 7oC). How many liters of cold water must Edna add so that the bathwater reaches a comfortable temperature of 38oC?

[Bonus: Will the bathtub overflow? The manufacturer told Edna

it was an 80-gallon tub.]

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