Question
Mrs Barbara bought a 4-litre bottle of detergent. She used 12 ℓ of the detergent in February and 13 ℓ in March. How much oil had she left?
3 m

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Mrs Barbara bought a 4-litre bottle of detergent. She used 12 ℓ of the detergent in February and 13 ℓ in March. How much oil had she left?