Question

There are 55 chairs that are arranged in rows, to form a triangular shape. Each
side of the triangle has the same number of chairs. How many rows are there in
this arrangement?​

Answer 1

Answer:

one row there are 18 share hand and there is one chair will left

Step-by-step explanation:

because if we divide 3 from 55 we get 18 because 18 x 3 equal to 54 and you said that each side of triangle has same shares so one chair was left