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`1/5` of a rectangular plastic box which is 45 cm long, 30 cm wide and 20 cm high was filled with a solution.
Tom transfers some of the solution from the plastic box to a steel tank until it is filled to its brim.
2 litres of solution are left in the plastic box.
The steel tank is 20 cm long and 17cm wide.
Find the height of the steel tank.