A tank was 3/5 filled with water. After removing 120 litres of water from the tank it was 1/5 filled.

a)Find the amount of water the tank can hold when completely filed.
b)If one litre of water has a mass of 1 kg, find the mass of water in the tank when filled.

3 answers

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a)600 liter.
b)600 kgs.

I don't understand