A pharmacist poured a 4% NaCl solution into a flask already containing a NaCl solution of unknown concentration. If the total volume of the mixed solution in the flask is 200 mL and its concentration is 2.5% NaCl, how many milliliters of the 4% NaCl solution was poured into the flask?
A. 125
B. 150
C. 200
D. 250
Answer: A
Health & Biomechanics
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