Question
PSLE
Mrs Tan had a bottle of oil. She used an equal amount of oil each day. At the end of the fifth day, she had 800 mℓ of oil left. At the end of the seventh day, she had two-thirds of the bottle of oil left. How many litres of oil were there in the bottle at first?
2 m

Click button first when a symbol is required. X

PSLE
Mrs Tan had a bottle of oil. She used an equal amount of oil each day. At the end of the fifth day, she had 800 mℓ of oil left. At the end of the seventh day, she had two-thirds of the bottle of oil left. How many litres of oil were there in the bottle at first?