Age - Exercise resolution

Hello everyone, in this class I will solve some exercises about ages; I hope you like it and understand the subject.
QUESTION 1
(TCE-SP- VUNESP/2017) Today the ratio between my age and my son's age is 3/2, and the sum of our ages is 120 years. It has happened that this ratio was equal to 3, and, on that occasion, my son's age, in years, was equal to:
(A) 14.
(B) 16.
(C) 8.
(D) 10.
(E) 12.
QUESTION 2
(TCE-SP- VUNESP/2017) I have a son. I was born 20 years before him. In ten years I will be twice his age. Today the ratio between his age and mine is equal to:
(A) 1/3
(B) 1/6
(C) 1/2
(D) 1/5
(E) 1/4
QUESTION 3
(City Hall of Serra Branca - PB) Six years ago, the ages of two people were in a ratio of 6 to 11. Currently, the ages of the same two people are in a ratio of 3 to 5. How old is the youngest currently?
(A) 32
(B) 30
(C) 28
(D) 26
(E) 24
QUESTION 4
(NC-UFPR - 2016 - Prefeitura de Curitiba - PR - Enfermeiro) The sum of the ages of André and his son Bernardo is equal to 36. Knowing that Bernardo's age corresponds to 20% of André's age, what is the difference between the ages of André and Bernardo?
(A) 20
(B) 24.
(C) 25
(D) 28
(E) 29
QUESTION 5
If I live to be 100, I will still live 3/2 of my current age. How old am I?
(A) 28
(B) 30
(C) 35
(D) 40
(E) 45
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