Question
PSLE
Barbara had a bottle of washing liquid. She used an equal amount of washing liquid each day. At the end of the 12th day, 13 of the bottle was left. At the end of the 16th day, the amount of washing liquid left was 600 mℓ. What was the amount of washing liquid in the bottle at first? Express your answer in mℓ.
2 m

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PSLE
Barbara had a bottle of washing liquid. She used an equal amount of washing liquid each day. At the end of the 12th day, 13 of the bottle was left. At the end of the 16th day, the amount of washing liquid left was 600 mℓ. What was the amount of washing liquid in the bottle at first? Express your answer in mℓ.