How much canned cat food should I feed my cats?

Vanessa asked:

I have two cats. One is a year old, the other seems to be two.

I was wondering how much cat food they should get a day. (It is canned cat food)
I understand how the weight thing should work, but until I can find a accurate scale I’ve gotta go by holding-the-cat-and-guessing.
We had dry food, I don’t know if we’ll get it. Besides, I didn’t ask about what wet food causes, I asked about how much they should be getting.

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