Mathematics, 30.07.2019 11:00, homeschool0123

Some amount of billiard balls were arranged in an equilateral triangle. and 13 balls were extra. when the same set of billiard balls were arranged into triangle in which each side has one more ball than in the first arrangement there were 7 balls shortage. how many balls were at the set?if you absolutly know the !

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Some amount of billiard balls were arranged in an equilateral triangle. and 13 balls were extra. whe...