Question 567922
2 years gao Nathalie ---x years
Anton 3x

After 4 years
Nathalie  will be x+6
Anton 3x+6

3x+6 =2(x+6)

3x+6 =2x+12
3x-2x=12-6
x=6

2 years ago Nathalie was 6 years
now she is 8 years
Anton was 3x years = 3*6 = 18.
so he wil be 20 years now