A 60-gallon bathtub is to be filled with water that is exactly 120°F. Unfortunately, the two sources of water available are 135°F and 70°F. When mixed, the temperature will be a weighted average based on the amount of each water source in the mix. How much of each should be used to fill the tub as specified? Amount of 135°F water: Amount of 70°F water: gallons gallons

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