Question

plz find the mistake

Answer 1

It's three years hence. You have to add 3 years to the ages of both father and son and not three years

Answer 2

Hey

Here is your answer,

Let father age be x,
Let son age be y
x = 3y + 3

x + 3 = 2(y + 3) + 10
3y + 3 + 3 = 2y + 6 + 10
3y + 6 = 2y + 16
3y - 2y = 16 - 6
y = 10

x = 3y + 3
x = 3 × 10 + 3
x = 30 + 3
x = 33

The present age of the father is 33 years old

Hope it helps you!