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Three tubes contain 1.5 mL of saline. 0.5 mL of a sample containing 10.0mg% of urea is added to tube #1. After mixing, 0.5 mL

Three tubes contain 1.5 mL of saline. 0.5 mL of a sample containing 10.0mg% of urea is added to tube #1. After mixing, 0.5 mL of this was added to tube #2 and mixed. Then 0.5 mL of this is added to tube #3 and mixed. What is the urea concentration in tube #3?

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