IOM 2020, Блиц — Задача 74

The Blitz-contest of IOM-2020

Условие

Consider all pairs (r,s)(r, s) of integers such that 0<s<2000 < s < 200 satisfying:

4561>rs>5980.\frac{45}{61} > \frac{r}{s} > \frac{59}{80}.

Find the sum of all integers in such pairs.

Отговори

Решение

Внимание: Непълно решение

The source contains only the answer key, no worked solution.

Оригинал в Архива: iom-2020-blitz-tasks.pdf · официални решения: iom-2020-blitz-answers.pdf