Hot ball in cold water

A metal ball with temperature 80C80 ^\circ\text{C} is dropped in water with temperature 30C30 ^\circ\text{C}. The metal ball and water exchange heat with each other, and after a while both their temperatures become constant.

Assuming that no heat has been lost to or gained from the surroundings and the container, if the water temperature has been raised by 10C10 ^\circ\text{C}, what is the decrease in the temperature of the ball?

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