Answer: 48, 432, 148
Step-by-step explanation:
Set X (the "first" number), Y, and Z as the three unknown numbers.
Y = 9*X [One number is 9 times a first number]
Z = X + 100 {A third number is 100 more than the first number]
X+Y+Z = 628 [sum of the three numbers is 628]
X + 9X + X + 100= 628
11X = 528
X = 48
Y = 9*48 = 432
Z = 148
