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`3/5` of a rectangular fish tank which is 70 cm long, 60 cm wide and 30 cm high is filled with water.
Gera transfers some of the water from the fish tank to a rectangular steel tank until it is filled to its brim.
5 litres of water are left in the fish tank.
The steel tank is 50 cm long and 40 cm wide.
Find the height of the steel tank.
Notes to students: