От арбуза массой 2кг 400г Ване отрезали 1/5часть, а Ане - 1/6 часть арбуза. ему равна масса каждого отрезанного куска?               
Желательно подробное решение для 5го класса.

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Last century there was a vere interesting museum in London.It was called the Museum of the Moving Image.Everyone enjoyed their visit to MOMI.In MOMI the history and magic of cinema and TV was explained.There were hundreds of clips from films and TV programmes.Visitors took an active part.You could act in a Hollywood Western,select a film to watch,or even draw your own  cartoon film.During your visit you could also meet characters from the past.Visitors could ask any questions about the time in history from which the characters came.It was both interesting and goor fun! 

(пересказ на английском)

Для озеленения улицы привезли 12 берез и 15 каштанов Береза стоит х гривен, а каштаны в два раза дороже. Запиши выражение сколько стоят саженци.