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.
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
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