Question

Yosef is twice as old as his sister Joy. When Yosef was 8 years younger, he was the age his sister is now.

Which equation can be used to solve for J, Joy’s age now?
1. J-8=2
2. J+2=8J
3. 2J-8=J
4. 2J+8=J

Answer 1

3. 2J-8=J

Explanation:

Yosef is twice as old as his sister Joy (2J). When he was 8 years younger (-8) he was the age his sister is now (=J).