Answer:
Brian is 18 yr old and Charlie is 9 yr old
Explanation:
Let age of Brian be B and that of Charlie be C,
Now,B=2×C and also three years after their ages are B+3 and C+3 respectively
(B+3)+(C+3)=33
Put B=2C
2C+3+C+3=33
3C=27
C=9
Now B=2×9=18
Brian is 18 yr old and Charlie is 9 yr old