6. Anna is now four times as old as her brother jong. In 4years, Anna's age will be twice Jong's age then. how old is each now?
Let's assume Anna's age is A and Jong's age is J.
According to the first statement, we have:
A = 4J
According to the second statement, in 4 years:
A + 4 = 2(J + 4)
Substitute the value of A from the first equation into the second equation:
4J + 4 = 2(J + 4)
4J + 4 = 2J + 8
2J = 4
J = 2
Now, substitute the value of Jong's age back into the first equation:
A = 4(2)
A = 8
Therefore, Anna is 8 years old and Jong is 2 years old.