Question

Frank is eight years older than his sister. In three years he will be twice as old as she is. How old are they now?​

Answer 1

than his sister. In three years he will be twice as old

Answer 2

Answer:

Step-by-step explanation:

 

Let the sister's age now x years, then Frank's age is now x+8 years. After 3 years their ages will be: Frank's age x+11 and his sister's age x+3.

 

Since after 3 years Frank's age is twice as old as she is, write the equation.  

x+11=2(x+3)=>x=5. Frank is now 5+8=13 years old.  

Answer:Frank is now 13 years old and his sister is 5 years old.