Fishy problem using speech recognition

This term, we done a lot of maths problems, but this is my favourite one. I wrote this using speech recognition, try and figure it out.

Fishy problem

Millie has just got a new pet fish. The pet shop owner told her that she needs to put the fish into exactly 1 litre of water. The problem is she can only find 2 containers. One holds 7 litres and the other holds 4 litres. Can you use these two containers to put exactly 1 litre of water into the fish tank?

First I filled up the 4 litre container and then I put four litres of water in 7 litres which means that the 7 litre container now 4 litres in it. Then I filled up the 4 litre container again. And then I put the 4 litres into the 7 litres, but I had 1 litre left in my 7 litre container otherwise it would overflow and that's how I got 1 litre.