The Olympiad Corner Republic of Moldova Xl Mathematical Olympiad
نویسنده
چکیده
4. Two brothers sold n lambs at a price n dollars. They divide the money as follows: the elder brother took 10 dollars, the younger one took 10 dollars, the elder one took again 10 dollars and so on. At the end it turned out that the sum for the younger brother was less than 10. He took the remainder and the pen-knife of his brother. The brothers agreed that the division was correct. What is the cost of the pen-knife?
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