Answer:
Robert is 28 years old
Step-by-step explanation:
If you are trying to see how old Robert is you should subtract how old his father was to 12 years.
4+4+4=12
His father is 12 years older than him making his son 28 years old.
Robert's father is 4 years older than 3 times Robert's age. His father is 40 years old.
