Аквариум имеет размеры 20 см, 30 см, 40 см. Форма аквариума - прямоугольный параллелепипед. Вода занимает 5/7 всего объема. Сколько литров воды всего в аквариуме?

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Quotations and sayings are part of our language and our way of life. As the poet Emerson said, we use of them by necessity; to remind ourselves to look before we leap or to avoid crossing our bridges before we come up to them. We use them by habit, often not realizing we are doing so much, and we all love to use an apt quotation to enliven conversation or score a point in an argument. This booklet contains over above a thousand quotations, proverbs and sayings. Together, they offer a great deal of the information, advice, amusement and comfort.
Emerson wrote 'I hate quotations ' so it is doubtful that he would have been used this book - but we hope that you will. Whether you use it to improve your knowledge more, as an aid to solving crossword puzzles, to enrich your own speech or simply for idle reading in your spare time, it will put you in to touch with some of the cleverest minds of the past and at present.
Happy reading and happy quoting!

В книге Л.Керролла"Алиса в стране чудес" есть один персонаж -Сумасшедший шляпник, сумасшедствие которого не просто выдумка автора,а реальное профессиональное  заболевание.Чем оно могло быть вызвано?