I already have a code for the app itself, and I want to add this part, but i have no idea on how to do that. Can someone please explain to me and provide me with a solution on how to do it in JavaFx, scenebuilder. "As a user I should be able to adjust the number of people a recipe is for by even numbers so that I get the correct amount of ingredients"   here is a wider explanation Also notice that the amount of ingredients should be adjustable to the number of persons who are going to eat, that is, it should be possible to set it to “for 2, 4, 6 or 8 persons” (possibly more, but only even numbers is sufficient)   But please when you answer the question describe more where I should put each line you provide. I have to be done with it soon before midnight. I know I posted the issue more than once but I get always the same answer without a description

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Running Time of Application

The application has a feature called running time. It is one of the parameters for measuring its performance. It is written in a particular language and is designed to perform a specific task. Applications run in a specific environment. The execution of the business will depend on the application’s running time. It must be optimized in order to get the maximum benefits out of the application.