Irene R. answered 01/03/20
BS in Mechanical Engineering and Certified math teacher for 13 years
If you were 6 and your sister was half of your age, she would have to be 3 years old (3 is half of 6).
If your brother was twice your age, then he would be 6 times 2 or 12 years old.
In 5 years, your sister would be 8 and your brother would be 17. The sum of their ages at that time
would be 8 + 17 = 25