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1-Iron has a density of 7.86. Lead has a density of 11.3. A graduated cylinder contains 151 ml of water and 12g of iron is added along with 20g of lead what is the new level of water in the cylinder?

2-Ga-68 has a half life of 68 minutes. If a diagnostic test starts with 15mCi of Ga-68, how much is left after the test if the test runs for 2 hr and 15 minutes?

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