Don reads 15 pages in 2 hours. At that rate, how long will it take him to read 45 pages? A 62 hours B 90 hours C 6 hours D 3 hou
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Lets say billiard balls are arranged in rows to form an equilateral triangle, then the first row consists of 1 ball, second row consists of 2 balls, and third row consists of 3 balls, and so on. So there must be balls in the
row.
So, the total number of balls that forms the equilateral triangle with rows is:
Let and
be the total number of balls in the first and second arrangements respectively.
Then,
It has been said that there were 11 lesser balls in the second arrangement:
Since,
multiplying both the sides by 2
Therefore,
So, there were 125 balls at the set.