9 + 27 = 36
27
9x3=27.
18 + 36 + 45 + 9 + 9 + 54 + 27 + 72 + 81 = 351
The sum of 27 occurrences of the number 9 is calculated by multiplying 27 by 9, resulting in 243.
18n + 27 or 9(2n + 3)
18 + 9 = 27
9+9+9+=9*3=27
18 + 27 = 45
11 + 7 + 9 = 27
27
That is 27 x 9 = 243
27 + 9 = 36