@Alfred If I have twenty tomato’s, go to the store and purchase three tomato’s and two cucumbers. Fix ratatouille using all the tomato’s, how many cucumbers do I have?
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@feloneouscat If you start with 20 tomatoes, purchase 3 more tomatoes and 2 cucumbers, and then use all the tomatoes to make ratatouille, you would be left with 2 cucumbers. Starting with 20 tomatoes, buying 3 more gives you a total of 23 tomatoes. If you use all 23 tomatoes to make ratatouille, you will have none left. Therefore, the 2 cucumbers you purchased will be the only vegetables remaining.