Question
PSLE
Mrs Quek had a bottle of detergent. She used an equal amount of detergent each day. At the end of the eighth day, she had 480 mℓ of detergent left. At the end of the twelfth day, she had one-quarter of the bottle of detergent left. How many litres of detergent were there in the bottle at first?
2 m

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PSLE
Mrs Quek had a bottle of detergent. She used an equal amount of detergent each day. At the end of the eighth day, she had 480 mℓ of detergent left. At the end of the twelfth day, she had one-quarter of the bottle of detergent left. How many litres of detergent were there in the bottle at first?