Vera and Vikki are sisters. Vera is 4 years old and Vikki is 13 years old .what age will each sister be when Vikki is twice as old as vera
When Vikki is twice as old as Vera, their age difference will still be 9 years. Since Vera is currently 4 years old, when Vikki is twice Vera's age, she will be 4 * 2 = 8 years old. At that time, Vikki will be 13 + (8-4) = 17 years old.
So, Vera will be 8 years old and Vikki will be 17 years old when Vikki is twice as old as Vera.