Explanation:

- Let's assign the present age of the son as 'x'.

- The father's current age, given as 3 years more than three times the son's age, will be expressed as: 3x + 3.

- In three years, the son’s age will be: x + 3.

- The father's age in three years will be: (3x + 3) + 3 = 3x + 6.

- According to the information, in three years the father's age will be 10 years more than twice the son’s age: 3x + 6 = 2(x + 3) + 10.

- Simplify the equation: 3x + 6 = 2x + 6 + 10, which becomes x = 10.

- Substitute x = 10 into the father's present age equation: 3(10) + 3 = 33.

Option:1, 36 years

- The calculation does not meet the conditions with x = 10.

Option:2, 33 years

- Matches the calculated result where x = 10.

Option:3, 40 years

- Surplus over calculated age with x = 10.

Option:4, 44 years

- Greater than the calculated age with x = 10.

Option:2, 33 years is the correct answer.