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Solution A: 13% alcohol
Solution B: 16% alcohol
She uses 4 times as much solution A as solution B, so if she used A milliliters of solution A and B milliliters of solution B:
A = 4B ...(1)
Then, the amount of alcohol is:
13% of A = 0.13A
16% of B = 0.16B
The resulting mixture has 544 mL, then:
0.13A + 0.16B = 544
Using (1):
0.13(4B) + 0.16B = 544
0.52B + 0.16B = 544
0.68B = 544
B = 800 mL
Elsa used 800 mL of solution B