Question 252955
This is reminiscent of the Archimedes story about the golden crown. Was it fake or not? After thinking for several days, Archimedes went to the bathhouse. He got into the bath and saw the water rise . . .Eureka! he shouted and ran down the street. HE realized that when you put something into water that is heavier - more dense - then the displacement of water is equal to the volume of the object.
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This is the same question. The water will rise by the same displacement of the total density or volume of the metal (iron).