Question
PSLE
Mrs Tay had a bottle of oil. She used an equal amount of oil each day. At the end of the fourth day, she had 720 mℓ of oil left. At the end of the sixth day, she had half of the bottle of oil left. How many litres of oil were there in the bottle at first?
2 m

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PSLE
Mrs Tay had a bottle of oil. She used an equal amount of oil each day. At the end of the fourth day, she had 720 mℓ of oil left. At the end of the sixth day, she had half of the bottle of oil left. How many litres of oil were there in the bottle at first?