Question

Однажды Гарри нашел потрепанную книгу без обложки. Осмотрев её, профессор Хогвартса высказал несколько предложений. Профессор Грабли Дерг сказал, что книга, скорее всего, написана Грюмом 20 лет назад. Профессор Снег решил, что книгу написал Люпин 5 лет назад. Профессор Макдонал думала, что книга не Грюма и написана 10 лет назад. После этого книгу очень долго рассматривал профессор Дамблодор. Закончив осмотр, он уверенно заявил, что каждый из профессоров прав, но только наполовину: в каждом из их утверждений одно предположение верное, а другое ложное. Так кем и когда была написана эта книга?

Answer 1

Написал Люпин 20 лет назад

Answer 2

The Mystery of the Tattered Book

One day, Harry stumbled upon a worn-out book without a cover. Intrigued, he examined it closely and sought the opinions of several Hogwarts professors regarding its origin. Each professor had a different theory about who wrote the book and when it was written.

- Professor Grabli Derg suggested that the book was most likely written by Grum 20 years ago. - Professor Sneg believed that Lupin wrote the book 5 years ago. - Professor MacDonald thought that the book was not written by Grum and was instead written 10 years ago. - Finally, Professor Dumbledore carefully examined the book for a long time and confidently declared that each professor was partially correct. In each of their statements, one assumption was true, while the other was false.

Based on the information provided, we can deduce the following:

1. Professor Grabli Derg's statement: The book was written by Grum 20 years ago. 2. Professor Sneg's statement: The book was written by Lupin 5 years ago. 3. Professor MacDonald's statement: The book was not written by Grum and was written 10 years ago.

Since each professor's statement contains one true and one false assumption, we can analyze their statements to determine the true author and the actual time of writing.

Let's break down the possibilities:

- If Professor Grabli Derg's statement is true, then the book was written by Grum 20 years ago. - If Professor Sneg's statement is true, then the book was written by Lupin 5 years ago. - If Professor MacDonald's statement is true, then the book was not written by Grum and was written 10 years ago.

From these possibilities, we can conclude that the book was written by Lupin because both Professor Grabli Derg and Professor MacDonald's statements cannot be true at the same time. Additionally, the book was written 5 years ago because Professor Sneg's statement is the only one that remains consistent.

Therefore, the tattered book was written by Lupin 5 years ago.