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A dilution written 1 : k means one part concentrate to k parts diluent, so the mixture has 1 + k parts in total and the concentrate is 1/(1 + k) of the final volume.
Dilution
concentrate = total / (1 + k), diluent = total × k / (1 + k)
Eleven parts of 0.454545 litres, so about 0.4545 litres of concentrate and 4.5455 litres of water — a 9.0909% solution.
No. 1 : 10 gives 1/11 ≈ 9.09%. A true 10% solution is a 1 : 9 dilution.