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Math·Algebra·Systems of two linear equations in two variables
hardA biologist mixed a solution that is 0.1% sodium chloride by mass with a solution that is 0.05% sodium chloride by mass to obtain a new solution, which has a mass of 90 grams and contains 0.07 grams of sodium chloride. How many grams of 0.1% sodium chloride solution did the biologist use?
A
0.14
B
40
C
50
D
89.86