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Suppose you should make tea and that you pour 3.4dl of boiling water into a cup....

Suppose you should make tea and that you pour 3.4dl of boiling water into a cup. You want to drink your tea at a temperature of 55 ° C and therefore plan to put ice cubes in the boiling water so that the temperature is right. You take ice cubes from the freezer where the temperature is 18 ° C. The ice cubes weigh 15 g. How many ice cubes should you put in your tea water? Suppose the teacup acts as a thermos and that no heat losses to the surroundings occur.
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