построй математическую модель задачи и реши задуманное число увеличили на 3 4/9 а патом уменшали на 2 5/6 . В результате получилось число 5 2/3 . Какое задуманное число ? 5 класса

Fill in the gaps in the conversation. Model: ...Pugacheva is a famous singer - Everybody knows that Pugacheva is a famous singer. 1. ...the life of a celebrity is happy and carefree, ...a lot of them suffer from depression. 2. ...you need to have very good connections if you want to achieve anything. ...our famous sports star Evgeniy Plushenko? He achieved everthing by hard work. 3. ...people with high self-esteem are good at anything they do.— ... brother is very ambitious, but he hasn't made a successful career, doesn't understand what he's doing wrong. 4. ...once you're discovered, you'll be getting more and more roles, hit doesn't make a star.

В магазине было несколько свитеров. До обеда продали 14 свитеров, а после обеда продали ещё 18. Сколько свитеров было в магазине, если их осталось21?