54 + 45 = 99
45 + x + 54 + x 2x + 99
54
45 + 9 = 54
45 + (20%) = 54
54
45 with the difference of 9 = 54
18 + 36 + 45 + 9 + 9 + 54 + 27 + 72 + 81 = 351
45
1/9 + 5/6 = 6/54 + 45/54 = 51/54 = 17/18 <-------------------------
45
gcf of 45 and 54 is 9.