Mathematics, 10.06.2020 15:57, nguyendavis17

Some amount of marbles were arranged in an equilateral triangle. And 2 marbles were extra. When the same set of marbles were arranged into triangle in which each side has one more marble than in the first arrangement there were 13 marbles shortage. How many marbles were in the set?

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Some amount of marbles were arranged in an equilateral triangle. And 2 marbles were extra. When the...