help with tracking pasta and rice

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I often make past and rice for my family.
On the package it says ( for example because the package isn't in front of me), 200 for 45g. I know that this 45g of dry product. If I am making it for my family I am going to be making enough for everyone at once. How do I figure out how much 45g dry product is cooked? I hope I am making some sence and that some one has maybe gone through this before.
Thanks for the help

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