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I need to know where I am going wrong since I am getting the wrong answer

12 litres of water are poured into an aquarium of $50$ cm length , $30$ cm breadth and $40$ cm Height.How high in cm will the water rise. (Ans 8 cm)

Edit: So I was making some very illogical assumptions however according to advice given which suggested that I keep the changing dimension value variable I got the answer which is

$1000cm^3$ = $50 \times 30 \times x$ so $x = \frac{1000}{1500}$. so $1$ litre has height $\frac{1000}{1500} = \frac {2}{3}$ so $12$ litres will give $12 \times \frac{2}{3} = 8 cm$

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    @MistyD I put it as answer, so that you can accept it (if you like). This will prevent your questions $fr$om been bumped by the automatic system. Cheers...2012-07-24

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Congratulation: your answer is correct!

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    @AsafKaragila I'll promise I'll do next time...2012-07-24