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Homework Statement:
 A 150g steel spoon (constant = 420J/kg degrees Celsius) initially at 19 degrees Celsius is placed into a 250mL cup of water at 89 degrees Celsius. When both objects reach the same temperature what temperature will that be?
Relevant Equations:

change in energy = (mass)(constant)(change in temperature)
water constant = 4200J (kg degrees Celsius)
I don't know what to do!