Mixing Hot And Cold

Tom's bathtub currently contains 15C15^\circ \text{C} water. He notices that if he adds some 30C30 ^\circ \text{C} water and mixes well, then the water gets warmer.

Tom would like to bathe in 38C38 ^\circ \text{C} water. Is it possible for him to heat the water in the bathtub up to 38C38 ^\circ \text{C} by adding sufficient amount of 30C30^\circ \text{C} water?

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