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Bunuel
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Let the initial quantity of solution be = x
0.08x = 0.2*20
x=50 (D)
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azamatboden
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I have it a little bit more complicated but it makes sense:
0.92x - y = 0.8(x-y)
x-Y = 20

solve these equations and get that x = 50
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I am not sure if this approach is wrong but works out.

8% solution to 20% solution is 2.5 times saltier

then 2.5 times of the remainder of 20 liters is 50 liters of original solution.
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