Question
At first, a container contained 15 ℓ of water. Xuan added another 13 ℓ of water into the container. Then she used 78 of all the water in the container. How much water did Xuan use? Express your answer as a fraction in its simplest form.
4 m

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At first, a container contained 15 ℓ of water. Xuan added another 13 ℓ of water into the container. Then she used 78 of all the water in the container. How much water did Xuan use? Express your answer as a fraction in its simplest form.