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Math·Problem-Solving and Data Analysis·Percentages
hard
A biologist mixed a solution that is 0.30% sodium chloride by mass with a solution that is 0.25% sodium chloride by mass to obtain a new solution, which has a mass of 90.00 grams and contains 0.24 grams of sodium chloride. How many grams of sodium chloride are contained in the 0.30% sodium chloride solution the biologist used?
1
0.09
2
.09