Answer:
Samantha: 28, Wilbert: 32, Zahir: 36.
Step-by-step explanation:
The difference of 2 ratio units corresponds to a difference of 8 years, so each ratio unit stands for 4 years.
The ratio of ages in years is ...
... 4×7 : 4×8 : 4×9 = 28 : 32 : 36