Answer:
Today, Kevin is 7 years old, and Uncle Rob 54 is years old.
Explanation:
Tonia will be 17 years old in 3 years, so, to get Tonia´s age now, make 17-3. She is 14 years old today.
As Tonia twice the age of Kevin, so, Kevin´s age is the actual age of Tonia divided by 2. That will be 14/2=7
To get Uncle´s age , we start at 17 years of Tonia, We must added it 3 years, so she will be 20 years old. Remember we have added 6 years from today.
Then, if uncles will be three times Tonia´s age, that will be =20*3=60.
Now, 6 years before, he is 60-6 =54 years