Question
PSLE
Mrs Song had a bottle of oil. She used an equal amount of oil each day. At the end of the fourth day, she had 400 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 Song had a bottle of oil. She used an equal amount of oil each day. At the end of the fourth day, she had 400 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?