How finely should I chop carrots and how many tomatoes for 15 cups of soup?

I forgot to divide my carrots centrefold middle section while preparing my cabbage soup this morning. Also is 5 large tomatoes enough for 15 cups of soup? My dad told me to use all the tomatoes, but I don’t think he realizes we have 10 and not 5 large tomatoes.

How finely should I chop carrots and how many tomatoes for 15 cups of soup?
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