How many liters of a 15% NaCl solution should be mixed with 1 L of a 20% NaCl solution to obtain a 16% NaCl solution?
What will be an ideal response?
Let x = the amount of 15% NaCL solution.
0.15(x) + 0.20(1) = 0.16(x + 1)
0.15x + 0.20 = 0.16x + 0.16
0.04 = 0.01x
x = 4 L
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