describe different ways that you can show a story problem. use one of the problems in this lesson as your example???..... There were 21 children in thelibrary .after 7children left the library, how many children were still in the library?

Answer:Total 14 children were still in the library Step-by-step explanation:The total number of students in a library is 21. After that 7 children left the library.If x children arrive in the library, the number of  students in the library are increased by x. It means we have to add x units to the total number of students in the library.If y children left the library, the number of  students in the library are decreased by y. It means we have to subtract x units from the total number of students in the library.Since the 7 children left the library, therefore the number of students reduced by 7.[tex]Students=21-7[/tex][tex]Students=14[/tex]Therefore 14 children were still in the library.