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A fish tank with a base of length 25 cm and width 20 cm holds 5.5 litres of water.

(a) Calculate the height of the water level in the tank.

(b) If I pour another 3.5 litres of water into the tank, what will be the new height of the water?

Notes to students:

If the question above has parts, (e.g. (a) and (b)), given that the answer for part (a) is 10 and the answer for part (b) is 12, give your answer as:10,12