Question
Yen poured 56 ℓ of water into a mug. She drank some of it and used 13 ℓ  to water her marigolds. 310 ℓ of water was then left in the mug. How much water did Yen drink?
3 m

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Yen poured 56 ℓ of water into a mug. She drank some of it and used 13 ℓ  to water her marigolds. 310 ℓ of water was then left in the mug. How much water did Yen drink?