Problem: If the amount of 51, used to label red blood cells, in a sample decreases from 1.6 mg to 0.40 mg in 55.4 days, what is the half-life of chromium 51? Express your answer using three significant figures.

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If the amount of 51, used to label red blood cells, in a sample decreases from 1.6 mg to 0.40 mg in 55.4 days, what is the half-life of chromium 51? 

Express your answer using three significant figures.